Vulnerability-Lookup

UBUNTU-CVE-2026-122299 (CVE-2026-122299)

Vulnerability from osv_ubuntu – Published: 2026-11-05 00:00 – Updated: 2026-11-05 00:00 – Source website

Details

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

8.8 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-122299	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-122299	REPORT
	https://github.com/jelmer/dulwich/commit/b77f385b…	REPORT
	https://github.com/jelmer/dulwich/releases/tag/du…	REPORT
	https://www.vulncheck.com/advisories/dulwich-befo…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pypy-dulwich",
            "binary_version": "0.12.0-1build2"
          },
          {
            "binary_name": "python-dulwich",
            "binary_version": "0.12.0-1build2"
          },
          {
            "binary_name": "python3-dulwich",
            "binary_version": "0.12.0-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "dulwich",
        "purl": "pkg:deb/ubuntu/dulwich@0.12.0-1build2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.11.2-1ubuntu1",
        "0.12.0-1",
        "0.12.0-1build1",
        "0.12.0-1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pypy-dulwich",
            "binary_version": "0.18.5-1"
          },
          {
            "binary_name": "python-dulwich",
            "binary_version": "0.18.5-1"
          },
          {
            "binary_name": "python3-dulwich",
            "binary_version": "0.18.5-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "dulwich",
        "purl": "pkg:deb/ubuntu/dulwich@0.18.5-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.18.2-1build1",
        "0.18.5-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pypy-dulwich",
            "binary_version": "0.19.15-1build1"
          },
          {
            "binary_name": "python3-dulwich",
            "binary_version": "0.19.15-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "dulwich",
        "purl": "pkg:deb/ubuntu/dulwich@0.19.15-1build1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.19.11-2",
        "0.19.14-4ubuntu1",
        "0.19.15-1",
        "0.19.15-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-dulwich",
            "binary_version": "0.20.31-1.1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "dulwich",
        "purl": "pkg:deb/ubuntu/dulwich@0.20.31-1.1build1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.20.15-1ubuntu1",
        "0.20.31-1ubuntu1",
        "0.20.31-1.1",
        "0.20.31-1.1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-dulwich",
            "binary_version": "0.21.6-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "dulwich",
        "purl": "pkg:deb/ubuntu/dulwich@0.21.6-1build2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.21.6-1",
        "0.21.6-1build1",
        "0.21.6-1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-dulwich",
            "binary_version": "1.2.12-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "dulwich",
        "purl": "pkg:deb/ubuntu/dulwich@1.2.12-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.0-3",
        "1.2.12-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-dulwich",
            "binary_version": "1.1.0-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "dulwich",
        "purl": "pkg:deb/ubuntu/dulwich@1.1.0-3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.22.7-1",
        "0.24.2-2",
        "1.1.0-2ubuntu1",
        "1.1.0-3"
      ]
    }
  ],
  "aliases": [],
  "details": "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": "UBUNTU-CVE-2026-122299",
  "modified": "2026-11-05T00:00:00Z",
  "published": "2026-11-05T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-122299"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-122299"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jelmer/dulwich/commit/b77f385b4b0d2d2c7f5ac39dae628948f7ad3a96"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.20"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/dulwich-before-commit-parser-tree-header-misinterpretation"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-122299"
  ]
}

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

Title

Dulwich before 1.2.20 Commit Parser Tree Header Misinterpretation

Summary

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

3 references

URL	Tags
https://github.com/jelmer/dulwich/releases/tag/du…	patchrelease-notes
https://github.com/jelmer/dulwich/commit/b77f385b…	issue-tracking
https://www.vulncheck.com/advisories/dulwich-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
jelmer	dulwich	Affected: 0 , < 1.2.20 (semver)

Date Public

2026-11-04 00:00

Credits

Isabel Mill

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/jelmer/dulwich",
          "product": "dulwich",
          "repo": "https://github.com/jelmer/dulwich",
          "vendor": "jelmer",
          "versions": [
            {
              "lessThan": "1.2.20",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Isabel Mill"
        }
      ],
      "datePublic": "2026-11-04T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1250",
              "description": "Improper Preservation of Consistency Between Independent Representations of Shared State",
              "lang": "en",
              "type": "CWE"
            },
            {
              "cweId": "CWE-115",
              "description": "Misinterpretation of Input",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-04T22:57:13.686Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "Vendor Patch",
          "tags": [
            "patch",
            "release-notes"
          ],
          "url": "https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.20"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "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"
        }
      ],
      "tags": [
        "x_open-source"
      ],
      "title": "Dulwich before 1.2.20 Commit Parser Tree Header Misinterpretation",
      "x_generator": {
        "engine": "vulncheck"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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