CVE-2026-122299 (GCVE-0-2026-122299)

Vulnerability from cvelistv5 – Published: 2026-11-04 22:57 – Updated: 2026-11-04 22:57 X_Open Source
VLAI
Title
Dulwich before 1.2.20 Commit Parser Tree Header Misinterpretation
Summary
Dulwich before 1.2.20 contains a commit object parsing vulnerability where the read path in _parse_commit resolves a duplicate tree header to the last occurrence instead of the first, diverging from core git's resolution behavior, while Poetry 2.5.1 ships this version and uses dulwich by default for git dependency installation. Attackers can craft a commit object with two tree headers so that reviewers and CI using git see a benign tree while Poetry's dulwich-based checkout resolves to a different attacker-controlled tree containing malicious build scripts such as setup.py, resulting in unreviewed code execution on the install or build host.
Severity
8.6 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
  • CWE-1250 - Improper Preservation of Consistency Between Independent Representations of Shared State
  • CWE-115 - Misinterpretation of Input
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7427 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
jelmer dulwich Affected: 0 , < 1.2.20 (semver)
guessed Create a notification for this product.
Date Public
2026-11-04 00:00
Credits
Isabel Mill
Show details on NVD website
To clipboard 

{
  "containers": {
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        {
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          "packageURL": "pkg:github/jelmer/dulwich",
          "product": "dulwich",
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
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        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "attackRequirements": "NONE",
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            "baseScore": 8.6,
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            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
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      "problemTypes": [
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          "descriptions": [
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              "description": "Improper Preservation of Consistency Between Independent Representations of Shared State",
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              "type": "CWE"
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            {
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-04T22:57:13.686Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
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          "url": "https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.20"
        },
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          "tags": [
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          ],
          "url": "https://github.com/jelmer/dulwich/commit/b77f385b4b0d2d2c7f5ac39dae628948f7ad3a96"
        },
        {
          "name": "VulnCheck Advisory: Dulwich before 1.2.20 Commit Parser Tree Header Misinterpretation",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/dulwich-before-commit-parser-tree-header-misinterpretation"
        }
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      "tags": [
        "x_open-source"
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      "title": "Dulwich before 1.2.20 Commit Parser Tree Header Misinterpretation",
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  "cveMetadata": {
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    "cveId": "CVE-2026-122299",
    "datePublished": "2026-11-04T22:57:13.686Z",
    "dateReserved": "2026-11-04T22:50:56.323Z",
    "dateUpdated": "2026-11-04T22:57:13.686Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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                "product": "dulwich",
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        "cveTags": [],
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            "value": "Dulwich before 1.2.20 contains a commit object parsing vulnerability where the read path in _parse_commit resolves a duplicate tree header to the last occurrence instead of the first, diverging from core git\u0027s resolution behavior, while Poetry 2.5.1 ships this version and uses dulwich by default for git dependency installation. Attackers can craft a commit object with two tree headers so that reviewers and CI using git see a benign tree while Poetry\u0027s dulwich-based checkout resolves to a different attacker-controlled tree containing malicious build scripts such as setup.py, resulting in unreviewed code execution on the install or build host."
          }
        ],
        "id": "CVE-2026-122299",
        "lastModified": "2026-11-04T23:17:23.883",
        "metrics": {
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                "exploitMaturity": "NOT_DEFINED",
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                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
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      "cve": "CVE-2026-122299",
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      "product_status:under_investigation": "24",
      "source": "Red Hat CSAF VEX",
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      "title": "dulwich: dulwich: Arbitrary code execution via duplicate tree header parsing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-122299.json",
      "version": "3"
    }
  }
}



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