{
    "document": {
        "category": "csaf_base",
        "csaf_version": "2.0",
        "distribution": {
            "tlp": {
                "label": "WHITE"
            }
        },
        "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."
            }
        ],
        "publisher": {
            "category": "coordinator",
            "contact_details": "cert@ncsc.nl",
            "name": "National Cyber Security Centre",
            "namespace": "https://www.ncsc.nl/"
        },
        "title": "CVE-2026-29780",
        "tracking": {
            "current_release_date": "2026-03-23T03:22:52.032757Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-29780",
            "initial_release_date": "2026-03-05T00:39:57.995446Z",
            "revision_history": [
                {
                    "date": "2026-03-05T00:39:57.995446Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)."
                },
                {
                    "date": "2026-03-05T00:40:05.910452Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-03-05T06:35:31.789519Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (39).| Product Identifiers created (38).| References created (3).| CWES updated (1)."
                },
                {
                    "date": "2026-03-05T06:35:36.448444Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-07T15:38:45.612002Z",
                    "number": "5",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (3).| CWES updated (1)."
                },
                {
                    "date": "2026-03-07T15:38:53.489618Z",
                    "number": "6",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-07T16:25:05.940334Z",
                    "number": "7",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)."
                },
                {
                    "date": "2026-03-07T16:25:13.180864Z",
                    "number": "8",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-08T14:49:18.258520Z",
                    "number": "9",
                    "summary": "Source created.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-09T17:02:46.887080Z",
                    "number": "10",
                    "summary": "References created (1)."
                },
                {
                    "date": "2026-03-09T18:36:02.700306Z",
                    "number": "11",
                    "summary": "References created (1)."
                },
                {
                    "date": "2026-03-09T18:39:23.302085Z",
                    "number": "12",
                    "summary": "Unknown change."
                },
                {
                    "date": "2026-03-11T22:25:03.179984Z",
                    "number": "13",
                    "summary": "Products created (1).| Product Identifiers created (1).| Exploits created (1)."
                },
                {
                    "date": "2026-03-11T22:25:08.813804Z",
                    "number": "14",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-20T09:34:50.264736Z",
                    "number": "15",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-20T09:34:53.760643Z",
                    "number": "16",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "16"
        }
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                                "product": {
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                            {
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                                    "product_id": "CSAFPID-5760931"
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                        "name": "eml-parser"
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                    {
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                                "product": {
                                    "name": "vers:unknown/<2.0.1",
                                    "product_id": "CSAFPID-5769857"
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                            }
                        ],
                        "category": "product_name",
                        "name": "eml_parser"
                    }
                ],
                "category": "vendor",
                "name": "GOVCERT-LU"
            },
            {
                "branches": [
                    {
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                            {
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                                "name": "vers:unknown/<2.0.1",
                                "product": {
                                    "name": "vers:unknown/<2.0.1",
                                    "product_id": "CSAFPID-5800186",
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                        ],
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                        "name": "eml_parser"
                    }
                ],
                "category": "vendor",
                "name": "govcert.lu"
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        ]
    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-29780",
            "cwe": {
                "id": "CWE-22",
                "name": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "### Summary\nThe official example script `examples/recursively_extract_attachments.py` contains a path traversal vulnerability that allows arbitrary file write outside the intended output directory. Attachment filenames extracted from parsed emails are directly used to construct output file paths without any sanitization, allowing an attacker-controlled filename to escape the target directory.\n\n### Details\nFile: `examples/recursively_extract_attachments.py`\nLines: 61–64\n```python\nfor a in m['attachment']:\n    out_filepath = out_path / a['filename']  # No sanitization\n    print(f'\\tWriting attachment: {out_filepath}')\n    with out_filepath.open('wb') as a_out:\n        a_out.write(base64.b64decode(a['raw']))\n```\n\nThe value `a['filename']` is attacker-controlled via crafted email attachment headers:\n```\nContent-Disposition: attachment; filename=\"../outside/pwned.txt\"\n```\n\nNo path normalization or boundary validation is performed before writing.\n\n### PoC\n1. Create a malicious `.eml` file:\n```\nContent-Disposition: attachment; filename=\"../outside/pwned.txt\"\n```\n2. Run the example script:\n```\npython recursively_extract_attachments.py -p ./emails -o ./safe\n```\n3. Expected: `./safe/pwned.txt`  \n4. Actual: `./outside/pwned.txt` ← written outside the intended directory\n\nVerified on Kali Linux with eml_parser installed via pip in a virtual environment.\n\n### Impact\nThis vulnerability is limited to the **example script only** and does not affect the core eml_parser library. However, as the script is part of the official repository and is likely to be adapted for production use, an attacker supplying a crafted email could achieve arbitrary file write within the execution context.\n\nPotential attack scenarios include:\n- Cron job injection: `filename=\"../../etc/cron.d/backdoor\"`\n- Web shell upload: `filename=\"../../var/www/html/shell.php\"`\n- SSH key injection: `filename=\"../../home/user/.ssh/authorized_keys\"`\n\n### Recommended Fix\n```python\nimport os.path\n\nfor a in m['attachment']:\n    filename = os.path.basename(a['filename'])\n    out_filepath = out_path / filename\n\n    if not out_filepath.resolve().is_relative_to(out_path.resolve()):\n        print(f'[!] Skipping suspicious filename: {a[\"filename\"]}')\n        continue\n\n    print(f'\\tWriting attachment: {out_filepath}')\n    with out_filepath.open('wb') as a_out:\n        a_out.write(base64.b64decode(a['raw']))\n```",
                    "title": "github - https://github.com/advisories/GHSA-389r-rccm-h3h5"
                },
                {
                    "category": "description",
                    "text": "### Summary\nThe official example script `examples/recursively_extract_attachments.py` contains a path traversal vulnerability that allows arbitrary file write outside the intended output directory. Attachment filenames extracted from parsed emails are directly used to construct output file paths without any sanitization, allowing an attacker-controlled filename to escape the target directory.\n\n### Details\nFile: `examples/recursively_extract_attachments.py`\nLines: 61–64\n```python\nfor a in m['attachment']:\n    out_filepath = out_path / a['filename']  # No sanitization\n    print(f'\\tWriting attachment: {out_filepath}')\n    with out_filepath.open('wb') as a_out:\n        a_out.write(base64.b64decode(a['raw']))\n```\n\nThe value `a['filename']` is attacker-controlled via crafted email attachment headers:\n```\nContent-Disposition: attachment; filename=\"../outside/pwned.txt\"\n```\n\nNo path normalization or boundary validation is performed before writing.\n\n### PoC\n1. Create a malicious `.eml` file:\n```\nContent-Disposition: attachment; filename=\"../outside/pwned.txt\"\n```\n2. Run the example script:\n```\npython recursively_extract_attachments.py -p ./emails -o ./safe\n```\n3. Expected: `./safe/pwned.txt`  \n4. Actual: `./outside/pwned.txt` ← written outside the intended directory\n\nVerified on Kali Linux with eml_parser installed via pip in a virtual environment.\n\n### Impact\nThis vulnerability is limited to the **example script only** and does not affect the core eml_parser library. However, as the script is part of the official repository and is likely to be adapted for production use, an attacker supplying a crafted email could achieve arbitrary file write within the execution context.\n\nPotential attack scenarios include:\n- Cron job injection: `filename=\"../../etc/cron.d/backdoor\"`\n- Web shell upload: `filename=\"../../var/www/html/shell.php\"`\n- SSH key injection: `filename=\"../../home/user/.ssh/authorized_keys\"`\n\n### Recommended Fix\n```python\nimport os.path\n\nfor a in m['attachment']:\n    filename = os.path.basename(a['filename'])\n    out_filepath = out_path / filename\n\n    if not out_filepath.resolve().is_relative_to(out_path.resolve()):\n        print(f'[!] Skipping suspicious filename: {a[\"filename\"]}')\n        continue\n\n    print(f'\\tWriting attachment: {out_filepath}')\n    with out_filepath.open('wb') as a_out:\n        a_out.write(base64.b64decode(a['raw']))\n```",
                    "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/PyPI%2FGHSA-389r-rccm-h3h5.json?alt=media"
                },
                {
                    "category": "description",
                    "text": "eml_parser serves as a python module for parsing eml files and returning various information found in the e-mail as well as computed information. Prior to version 2.0.1, the official example script examples/recursively_extract_attachments.py contains a path traversal vulnerability that allows arbitrary file write outside the intended output directory. Attachment filenames extracted from parsed emails are directly used to construct output file paths without any sanitization, allowing an attacker-controlled filename to escape the target directory. This issue has been patched in version 2.0.1.",
                    "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-29780"
                },
                {
                    "category": "description",
                    "text": "eml_parser serves as a python module for parsing eml files and returning various information found in the e-mail as well as computed information. Prior to version 2.0.1, the official example script examples/recursively_extract_attachments.py contains a path traversal vulnerability that allows arbitrary file write outside the intended output directory. Attachment filenames extracted from parsed emails are directly used to construct output file paths without any sanitization, allowing an attacker-controlled filename to escape the target directory. This issue has been patched in version 2.0.1.",
                    "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-29780"
                },
                {
                    "category": "other",
                    "text": "0.00013",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "3.6",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "There is exploit data available from source Nvd, Exploit code publicly available",
                    "title": "NCSC Score top decreasing factors"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5760893",
                    "CSAFPID-5760894",
                    "CSAFPID-5760895",
                    "CSAFPID-5760896",
                    "CSAFPID-5760897",
                    "CSAFPID-5760898",
                    "CSAFPID-5760899",
                    "CSAFPID-5760900",
                    "CSAFPID-5760901",
                    "CSAFPID-5760902",
                    "CSAFPID-5760903",
                    "CSAFPID-5760904",
                    "CSAFPID-5760905",
                    "CSAFPID-5760906",
                    "CSAFPID-5760907",
                    "CSAFPID-5760908",
                    "CSAFPID-5760909",
                    "CSAFPID-5760910",
                    "CSAFPID-5760911",
                    "CSAFPID-5760912",
                    "CSAFPID-5760913",
                    "CSAFPID-5760914",
                    "CSAFPID-5760915",
                    "CSAFPID-5760916",
                    "CSAFPID-5760917",
                    "CSAFPID-5760918",
                    "CSAFPID-5760919",
                    "CSAFPID-5760920",
                    "CSAFPID-5760921",
                    "CSAFPID-5760922",
                    "CSAFPID-5760923",
                    "CSAFPID-5760924",
                    "CSAFPID-5760925",
                    "CSAFPID-5760926",
                    "CSAFPID-5760927",
                    "CSAFPID-5760928",
                    "CSAFPID-5760929",
                    "CSAFPID-5760930",
                    "CSAFPID-5760931",
                    "CSAFPID-5769857",
                    "CSAFPID-5800186"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - github",
                    "url": "https://github.com/advisories/GHSA-389r-rccm-h3h5"
                },
                {
                    "category": "external",
                    "summary": "Source raw - github",
                    "url": "https://api.github.com/advisories/GHSA-389r-rccm-h3h5"
                },
                {
                    "category": "external",
                    "summary": "Source - osv",
                    "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/PyPI%2FGHSA-389r-rccm-h3h5.json?alt=media"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-29780"
                },
                {
                    "category": "external",
                    "summary": "Source raw - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/29xxx/CVE-2026-29780.json"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29780"
                },
                {
                    "category": "external",
                    "summary": "Source raw - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-29780"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-29780"
                },
                {
                    "category": "external",
                    "summary": "Source raw - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; nvd; osv",
                    "url": "https://github.com/GOVCERT-LU/eml_parser/security/advisories/GHSA-389r-rccm-h3h5"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; nvd; osv",
                    "url": "https://github.com/GOVCERT-LU/eml_parser/issues/88"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; nvd; osv",
                    "url": "https://github.com/GOVCERT-LU/eml_parser/commit/99af03a09a90aaaaadd0ed2ffb5eea46d1ea2cc9"
                },
                {
                    "category": "external",
                    "summary": "Reference - github",
                    "url": "https://github.com/advisories/GHSA-389r-rccm-h3h5"
                },
                {
                    "category": "external",
                    "summary": "Reference - github; osv",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29780"
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
                        "baseScore": 5.5,
                        "baseSeverity": "MEDIUM"
                    },
                    "products": [
                        "CSAFPID-5760893",
                        "CSAFPID-5760894",
                        "CSAFPID-5760895",
                        "CSAFPID-5760896",
                        "CSAFPID-5760897",
                        "CSAFPID-5760898",
                        "CSAFPID-5760899",
                        "CSAFPID-5760900",
                        "CSAFPID-5760901",
                        "CSAFPID-5760902",
                        "CSAFPID-5760903",
                        "CSAFPID-5760904",
                        "CSAFPID-5760905",
                        "CSAFPID-5760906",
                        "CSAFPID-5760907",
                        "CSAFPID-5760908",
                        "CSAFPID-5760909",
                        "CSAFPID-5760910",
                        "CSAFPID-5760911",
                        "CSAFPID-5760912",
                        "CSAFPID-5760913",
                        "CSAFPID-5760914",
                        "CSAFPID-5760915",
                        "CSAFPID-5760916",
                        "CSAFPID-5760917",
                        "CSAFPID-5760918",
                        "CSAFPID-5760919",
                        "CSAFPID-5760920",
                        "CSAFPID-5760921",
                        "CSAFPID-5760922",
                        "CSAFPID-5760923",
                        "CSAFPID-5760924",
                        "CSAFPID-5760925",
                        "CSAFPID-5760926",
                        "CSAFPID-5760927",
                        "CSAFPID-5760928",
                        "CSAFPID-5760929",
                        "CSAFPID-5760930",
                        "CSAFPID-5760931",
                        "CSAFPID-5769857",
                        "CSAFPID-5800186"
                    ]
                }
            ],
            "title": "CVE-2026-29780"
        }
    ]
}