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go-git: Improper parsing of specially crafted objects may lead to inconsistent interpretation compared to upstream Git

Type: advisorySources: OSV

go-git is an extensible git implementation library written in pure Go. Prior to 5.19.0 and 6.0.0-alpha.3, 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. This vulnerability is fixed in 5.19.0 and 6.0.0-alpha.3.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-45022
Confirmed fixed CVEs
Not specified
Updated in this feed
6 Nov 2026, 19:11 UTC · Revision 1

Source evidence

go-git: Improper parsing of specially crafted objects may lead to inconsistent interpretation compared to upstream Git

core-osv · Original source

Published 27 May 2026, 14:54 UTC

go-git is an extensible git implementation library written in pure Go. Prior to 5.19.0 and 6.0.0-alpha.3, 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. This vulnerability is fixed in 5.19.0 and 6.0.0-alpha.3.

osv:CVE-2026-45022
Complete source record
{
  "id": "6ef54c606421a5cbe0e7bad48b6ea07a968222e8354abfedc2a7bebded9b5107",
  "url": "https://osv.dev/vulnerability/CVE-2026-45022",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "go-git: Improper parsing of specially crafted objects may lead to inconsistent interpretation compared to upstream Git",
    "summary": "go-git is an extensible git implementation library written in pure Go. Prior to 5.19.0 and 6.0.0-alpha.3, 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. This vulnerability is fixed in 5.19.0 and 6.0.0-alpha.3.",
    "evidence": "osv:CVE-2026-45022",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-45022",
      "aliases": [
        "CVE-2026-45022",
        "GHSA-389r-gv7p-r3rp",
        "GO-2026-5074"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-git/go-git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "bc930f4cbe095a3e1d49273655f73fcef7d41a42"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:go-git_project:go-git:*:*:*:*:*:go:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.19.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.18.0",
            "v5.17.2",
            "v5.17.1",
            "v5.17.0",
            "v5.16.5",
            "v5.16.4",
            "v5.16.3",
            "v5.16.2",
            "v5.16.1",
            "v5.16.0",
            "v5.15.0",
            "v5.14.0",
            "v5.13.2",
            "v5.13.1",
            "v5.13.0",
            "v5.12.0",
            "v5.11.0",
            "v5.10.1",
            "v5.9.0",
            "v5.10.0",
            "v5.8.1",
            "v5.8.0",
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            "v5.4.1",
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            "v5.3.0",
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            "v5.1.0",
            "v5.0.0",
            "v4.13.1",
            "v4.13.0",
            "v4.12.0",
            "v4.11.0",
            "v4.10.0",
            "v4.9.1",
            "v4.7.1",
            "v4.9.0",
            "v4.8.1",
            "v4.8.0",
            "v4.7.0",
            "v4.6.0",
            "v4.5.0",
            "v4.4.1",
            "v4.4.0",
            "v4.3.1",
            "v4.3.0",
            "v4.2.1",
            "v4.2.0",
            "v4.1.1",
            "v4.1.0",
            "v4.0.0",
            "v4.0.0-rc15",
            "v4.0.0-rc14",
            "v4.0.0-rc13",
            "v4.0.0-rc12",
            "v4.0.0-rc11",
            "v4.0.0-rc10",
            "v4.0.0-rc9",
            "v4.0.0-rc8",
            "v4.0.0-rc7",
            "v4.0.0-rc6",
            "v4.0.0-rc5",
            "v4.0.0-rc4",
            "v4.0.0-rc3",
            "v4.0.0-rc2",
            "v4.0.0-rc1",
            "v3.1.1",
            "v3.1.0",
            "v3.0.4",
            "v3.0.3",
            "v3.0.2",
            "v3.0.1",
            "v3.0.0",
            "v2.2.0",
            "v2.1.3",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.0.0",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45022.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:47.926930054Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45022.json",
        "https://github.com/go-git/go-git/security/advisories/GHSA-389r-gv7p-r3rp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-45022"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-180",
          "CWE-345"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45022.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-45022",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 515948,
  "published_at": "2026-05-27T14:54:47.872+00:00"
}