GHSA-389R-GV7P-R3RP

Vulnerability from github – Published: 2026-05-11 14:48 – Updated: 2026-06-08 23:42
VLAI
Summary
go-git's improper parsing of specially crafted objects may lead to inconsistent interpretation compared to upstream Git
Details

Impact

go-git may parse malformed Git objects in a way that differs from upstream Git. When commit or tag objects contain ambiguous or malformed headers, go-git’s decoded representation may expose values differently from how Git itself would interpret or reject the same object.

Additionally, go-git’s commit signing and verification logic operates over commit data reconstructed from go-git’s parsed representation rather than the original raw object bytes. As a result, go-git may sign or verify a commit payload that is not byte-for-byte equivalent to the object stored in the repository.

This can cause a signature to appear valid for a commit whose displayed or effective metadata differs from the object that was intended to be signed.

Patches

Users should upgrade to a patched version in order to mitigate this vulnerability. Versions prior to v5 are likely to be affected, users are recommended to upgrade to a supported go-git version.

Credit

Thanks to @bugbunny-research (https://bugbunny.ai/) for reporting this to sigstore/gitsign, and to @wlynch, @patzielinski and @adityasaky for coordinating the disclosure with the go-git project. :bow: :1st_place_medal:

Thanks to @wayphinder for reporting this to the go-git project. :bow:

Severity
7.0 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 6.0.0-alpha.2"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/go-git/go-git/v6"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0-alpha.1"
            },
            {
              "fixed": "6.0.0-alpha.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/go-git/go-git/v5"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.19.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-45022"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-180",
      "CWE-345"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-11T14:48:12Z",
    "nvd_published_at": "2026-05-27T15:16:29Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n`go-git` may parse malformed Git objects in a way that differs from upstream Git. When `commit` or `tag` objects contain ambiguous or malformed headers, `go-git`\u2019s decoded representation may expose values differently from how Git itself would interpret or reject the same object.\n\nAdditionally, `go-git`\u2019s commit signing and verification logic operates over commit data reconstructed from `go-git`\u2019s parsed representation rather than the original raw object bytes. As a result, `go-git` may sign or verify a commit payload that is not byte-for-byte equivalent to the object stored in the repository.\n\nThis can cause a signature to appear valid for a commit whose displayed or effective metadata differs from the object that was intended to be signed.\n\n### Patches\nUsers should upgrade to a patched version in order to mitigate this vulnerability. Versions prior to v5 are likely to be affected, users are recommended to upgrade to a supported `go-git` version.\n\n### Credit\n\nThanks to @bugbunny-research (https://bugbunny.ai/) for reporting this to `sigstore/gitsign`, and to @wlynch, @patzielinski and @adityasaky for coordinating the disclosure with the `go-git` project. :bow: :1st_place_medal: \n\nThanks to @wayphinder for reporting this to the `go-git` project. :bow:",
  "id": "GHSA-389r-gv7p-r3rp",
  "modified": "2026-06-08T23:42:41Z",
  "published": "2026-05-11T14:48:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-git/go-git/security/advisories/GHSA-389r-gv7p-r3rp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45022"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/go-git/go-git"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "go-git\u0027s improper parsing of specially crafted objects may lead to inconsistent interpretation compared to upstream Git"
}



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