{
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        "lang": "en",
        "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": {
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            "contact_details": "cert@ncsc.nl",
            "name": "National Cyber Security Centre",
            "namespace": "https://www.ncsc.nl/"
        },
        "title": "CVE-2026-27576",
        "tracking": {
            "current_release_date": "2026-03-22T18:47:48.621929Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
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            },
            "id": "CVE-2026-27576",
            "initial_release_date": "2026-02-20T22:39:48.418771Z",
            "revision_history": [
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                    "date": "2026-02-20T22:39:48.418771Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (6).| CWES updated (1)."
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                {
                    "date": "2026-02-20T22:39:50.428999Z",
                    "number": "2",
                    "summary": "NCSC Score created."
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                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (5).| CWES updated (1)."
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                    "date": "2026-02-21T10:25:09.051907Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
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                    "number": "5",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (5).| CWES updated (1)."
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                    "date": "2026-02-21T10:39:00.510665Z",
                    "number": "6",
                    "summary": "NCSC Score updated."
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                    "date": "2026-02-21T14:14:36.042111Z",
                    "number": "7",
                    "summary": "Source created.| CVE status created. (valid)| EPSS created."
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                    "number": "8",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (53).| References created (7).| CWES updated (1)."
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                    "number": "9",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (5).| CWES updated (1)."
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                {
                    "date": "2026-02-23T21:26:44.003739Z",
                    "number": "10",
                    "summary": "CVSS created.| Products connected (1).| Product Identifiers created (1)."
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                {
                    "date": "2026-02-23T21:26:46.828115Z",
                    "number": "11",
                    "summary": "NCSC Score updated."
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                {
                    "date": "2026-02-23T22:39:43.832639Z",
                    "number": "12",
                    "summary": "References created (1)."
                },
                {
                    "date": "2026-02-24T00:21:10.842517Z",
                    "number": "13",
                    "summary": "References created (1)."
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                {
                    "date": "2026-02-24T18:47:44.005184Z",
                    "number": "14",
                    "summary": "Unknown change."
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                {
                    "date": "2026-03-20T09:40:41.377571Z",
                    "number": "15",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
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                    "number": "16",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (2).| References created (8).| CWES updated (1)."
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    "vulnerabilities": [
        {
            "cve": "CVE-2026-27576",
            "notes": [
                {
                    "category": "description",
                    "text": "## Vulnerability\n\nThe ACP bridge accepted very large prompt text blocks and could assemble oversized prompt payloads before forwarding them to `chat.send`.\n\nBecause ACP runs over local stdio, this mainly affects local ACP clients (for example IDE integrations) that send unusually large inputs.\n\n## Affected Packages / Versions\n\n- Package: `openclaw` (npm)\n- Affected versions: `<= 2026.2.17`\n- Patched version: `2026.2.18` (planned next release)\n\n## Impact\n\n- Local ACP sessions may become less responsive when very large prompts are submitted\n- Larger-than-expected model usage/cost when oversized text is forwarded\n- No privilege escalation and no direct remote attack path in the default ACP model\n\n## Affected Components\n\n- `src/acp/event-mapper.ts`\n- `src/acp/translator.ts`\n\n## Remediation\n\n- Enforce a 2 MiB prompt-text limit before concatenation\n- Count inter-block newline separator bytes during pre-concatenation size checks\n- Keep final outbound message-size validation before `chat.send`\n- Avoid stale active-run session state when oversized prompts are rejected\n- Add regression tests for oversize rejection and active-run cleanup\n\n## Fix Commit(s)\n\n- `732e53151e8fbdfc0501182ddb0e900878bdc1e3`\n- `ebcf19746f5c500a41817e03abecadea8655654a`\n- `63e39d7f57ac4ad4a5e38d17e7394ae7c4dd0b9c`\n\nThanks @aether-ai-agent for reporting.",
                    "title": "github - https://github.com/advisories/GHSA-cxpw-2g23-2vgw"
                },
                {
                    "category": "description",
                    "text": "OpenClaw is a personal AI assistant. In versions 2026.2.17 and below, the ACP bridge accepts very large prompt text blocks and can assemble oversized prompt payloads before forwarding them to chat.send. Because ACP runs over local stdio, this mainly affects local ACP clients (for example IDE integrations) that send unusually large inputs. This issue has been fixed in version 2026.2.19.",
                    "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-27576"
                },
                {
                    "category": "description",
                    "text": "OpenClaw is a personal AI assistant. In versions 2026.2.17 and below, the ACP bridge accepts very large prompt text blocks and can assemble oversized prompt payloads before forwarding them to chat.send. Because ACP runs over local stdio, this mainly affects local ACP clients (for example IDE integrations) that send unusually large inputs. This issue has been fixed in version 2026.2.19.",
                    "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-27576"
                },
                {
                    "category": "description",
                    "text": "OpenClaw is a personal AI assistant. In versions 2026.2.17 and below, the ACP bridge accepts very large prompt text blocks and can assemble oversized prompt payloads before forwarding them to chat.send. Because ACP runs over local stdio, this mainly affects local ACP clients (for example IDE integrations) that send unusually large inputs. This issue has been fixed in version 2026.2.19.",
                    "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-27576.json?alt=media"
                },
                {
                    "category": "description",
                    "text": "## Vulnerability\n\nThe ACP bridge accepted very large prompt text blocks and could assemble oversized prompt payloads before forwarding them to `chat.send`.\n\nBecause ACP runs over local stdio, this mainly affects local ACP clients (for example IDE integrations) that send unusually large inputs.\n\n## Affected Packages / Versions\n\n- Package: `openclaw` (npm)\n- Affected versions: `<= 2026.2.17`\n- Patched version: `2026.2.18` (planned next release)\n\n## Impact\n\n- Local ACP sessions may become less responsive when very large prompts are submitted\n- Larger-than-expected model usage/cost when oversized text is forwarded\n- No privilege escalation and no direct remote attack path in the default ACP model\n\n## Affected Components\n\n- `src/acp/event-mapper.ts`\n- `src/acp/translator.ts`\n\n## Remediation\n\n- Enforce a 2 MiB prompt-text limit before concatenation\n- Count inter-block newline separator bytes during pre-concatenation size checks\n- Keep final outbound message-size validation before `chat.send`\n- Avoid stale active-run session state when oversized prompts are rejected\n- Add regression tests for oversize rejection and active-run cleanup\n\n## Fix Commit(s)\n\n- `732e53151e8fbdfc0501182ddb0e900878bdc1e3`\n- `ebcf19746f5c500a41817e03abecadea8655654a`\n- `63e39d7f57ac4ad4a5e38d17e7394ae7c4dd0b9c`\n\nThanks @aether-ai-agent for reporting.",
                    "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/npm%2FGHSA-cxpw-2g23-2vgw.json?alt=media"
                },
                {
                    "category": "description",
                    "text": "- Local ACP sessions may become less responsive when very large prompts are submitted\n- Larger-than-expected model usage/cost when oversized text is forwarded\n- No privilege escalation and no direct remote attack path in the default ACP model",
                    "title": "gitlab - https://gitlab.com/api/v4/projects/25847700/repository/files/npm%2Fopenclaw%2FCVE-2026-27576.yml/raw"
                },
                {
                    "category": "other",
                    "text": "5e-05",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
                    "title": "CVSSV4"
                },
                {
                    "category": "other",
                    "text": "4.8",
                    "title": "CVSSV4 base score"
                },
                {
                    "category": "other",
                    "text": "4.6",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "Is related to CWE-400 (Uncontrolled Resource Consumption)",
                    "title": "NCSC Score top increasing factors"
                },
                {
                    "category": "other",
                    "text": "The value of the most recent CVSS (V3) score",
                    "title": "NCSC Score top decreasing factors"
                }
            ],
            "product_status": {
                "fixed": [
                    "CSAFPID-5890213"
                ],
                "known_affected": [
                    "CSAFPID-5658228",
                    "CSAFPID-5502989",
                    "CSAFPID-5502990",
                    "CSAFPID-5502991",
                    "CSAFPID-5502992",
                    "CSAFPID-5502993",
                    "CSAFPID-5502994",
                    "CSAFPID-5502995",
                    "CSAFPID-5502996",
                    "CSAFPID-5502997",
                    "CSAFPID-5502998",
                    "CSAFPID-5502999",
                    "CSAFPID-5503000",
                    "CSAFPID-5503001",
                    "CSAFPID-5503002",
                    "CSAFPID-5503003",
                    "CSAFPID-5503004",
                    "CSAFPID-5503005",
                    "CSAFPID-5503006",
                    "CSAFPID-5503007",
                    "CSAFPID-5503008",
                    "CSAFPID-5503009",
                    "CSAFPID-5503010",
                    "CSAFPID-5503011",
                    "CSAFPID-5503012",
                    "CSAFPID-5503013",
                    "CSAFPID-5503014",
                    "CSAFPID-5503015",
                    "CSAFPID-5503016",
                    "CSAFPID-5503017",
                    "CSAFPID-5503018",
                    "CSAFPID-5503019",
                    "CSAFPID-5503020",
                    "CSAFPID-5503021",
                    "CSAFPID-5503022",
                    "CSAFPID-5503023",
                    "CSAFPID-5503024",
                    "CSAFPID-5503025",
                    "CSAFPID-5503026",
                    "CSAFPID-5559506",
                    "CSAFPID-5661660",
                    "CSAFPID-5661661",
                    "CSAFPID-5661662",
                    "CSAFPID-5661663",
                    "CSAFPID-5661664",
                    "CSAFPID-5661665",
                    "CSAFPID-5661666",
                    "CSAFPID-5661667",
                    "CSAFPID-5661668",
                    "CSAFPID-5661669",
                    "CSAFPID-5661670",
                    "CSAFPID-5661671",
                    "CSAFPID-5661672",
                    "CSAFPID-5661673",
                    "CSAFPID-5655242",
                    "CSAFPID-5679452",
                    "CSAFPID-5890214"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - github",
                    "url": "https://github.com/advisories/GHSA-cxpw-2g23-2vgw"
                },
                {
                    "category": "external",
                    "summary": "Source raw - github",
                    "url": "https://api.github.com/advisories/GHSA-cxpw-2g23-2vgw"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27576"
                },
                {
                    "category": "external",
                    "summary": "Source raw - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-27576"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-27576"
                },
                {
                    "category": "external",
                    "summary": "Source raw - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/27xxx/CVE-2026-27576.json"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-27576"
                },
                {
                    "category": "external",
                    "summary": "Source raw - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Source - osv",
                    "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-27576.json?alt=media"
                },
                {
                    "category": "external",
                    "summary": "Source - osv",
                    "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/npm%2FGHSA-cxpw-2g23-2vgw.json?alt=media"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Source - gitlab",
                    "url": "https://gitlab.com/api/v4/projects/25847700/repository/files/npm%2Fopenclaw%2FCVE-2026-27576.yml/raw"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; gitlab; nvd; osv",
                    "url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-cxpw-2g23-2vgw"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; gitlab; nvd; osv",
                    "url": "https://github.com/openclaw/openclaw/commit/63e39d7f57ac4ad4a5e38d17e7394ae7c4dd0b9c"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; gitlab; nvd; osv",
                    "url": "https://github.com/openclaw/openclaw/commit/8ae2d5110f6ceadef73822aa3db194fb60d2ba68"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; gitlab; nvd; osv",
                    "url": "https://github.com/openclaw/openclaw/commit/ebcf19746f5c500a41817e03abecadea8655654a"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; gitlab; nvd; osv",
                    "url": "https://github.com/openclaw/openclaw/releases/tag/v2026.2.19"
                },
                {
                    "category": "external",
                    "summary": "Reference - github; gitlab",
                    "url": "https://github.com/advisories/GHSA-cxpw-2g23-2vgw"
                },
                {
                    "category": "external",
                    "summary": "Reference - osv",
                    "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27576.json"
                },
                {
                    "category": "external",
                    "summary": "Reference - github; gitlab; osv",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27576"
                },
                {
                    "category": "external",
                    "summary": "Reference - gitlab",
                    "url": "https://github.com/openclaw/openclaw"
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                        "baseScore": 4.0,
                        "baseSeverity": "MEDIUM"
                    },
                    "products": [
                        "CSAFPID-5502989",
                        "CSAFPID-5502990",
                        "CSAFPID-5502991",
                        "CSAFPID-5502992",
                        "CSAFPID-5502993",
                        "CSAFPID-5502994",
                        "CSAFPID-5502995",
                        "CSAFPID-5502996",
                        "CSAFPID-5502997",
                        "CSAFPID-5502998",
                        "CSAFPID-5502999",
                        "CSAFPID-5503000",
                        "CSAFPID-5503001",
                        "CSAFPID-5503002",
                        "CSAFPID-5503003",
                        "CSAFPID-5503004",
                        "CSAFPID-5503005",
                        "CSAFPID-5503006",
                        "CSAFPID-5503007",
                        "CSAFPID-5503008",
                        "CSAFPID-5503009",
                        "CSAFPID-5503010",
                        "CSAFPID-5503011",
                        "CSAFPID-5503012",
                        "CSAFPID-5503013",
                        "CSAFPID-5503014",
                        "CSAFPID-5503015",
                        "CSAFPID-5503016",
                        "CSAFPID-5503017",
                        "CSAFPID-5503018",
                        "CSAFPID-5503019",
                        "CSAFPID-5503020",
                        "CSAFPID-5503021",
                        "CSAFPID-5503022",
                        "CSAFPID-5503023",
                        "CSAFPID-5503024",
                        "CSAFPID-5503025",
                        "CSAFPID-5503026",
                        "CSAFPID-5559506",
                        "CSAFPID-5655242",
                        "CSAFPID-5658228",
                        "CSAFPID-5661660",
                        "CSAFPID-5661661",
                        "CSAFPID-5661662",
                        "CSAFPID-5661663",
                        "CSAFPID-5661664",
                        "CSAFPID-5661665",
                        "CSAFPID-5661666",
                        "CSAFPID-5661667",
                        "CSAFPID-5661668",
                        "CSAFPID-5661669",
                        "CSAFPID-5661670",
                        "CSAFPID-5661671",
                        "CSAFPID-5661672",
                        "CSAFPID-5661673",
                        "CSAFPID-5679452",
                        "CSAFPID-5890214"
                    ]
                }
            ],
            "title": "CVE-2026-27576"
        }
    ]
}