GHSA-J39J-6GW9-JW6H

Vulnerability from github – Published: 2026-02-04 20:36 – Updated: 2026-02-04 20:36
VLAI?
Summary
git2 has potential undefined behavior when dereferencing Buf struct
Details

If the Buf struct is dereferenced immediately after calling new() or default() on the Buf struct, a null pointer is passed to the unsafe function slice::from_raw_parts. According to the safety section documentation of the function, data must be non-null and aligned even for zero-length slices or slices of ZSTs. Thus, passing a null pointer will lead to undefined behavior.

Severity ?
2.7 (Low)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "git2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.20.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-04T20:36:04Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "If the Buf struct is dereferenced immediately after calling new() or default() on the Buf struct, a null pointer is passed to the unsafe function slice::from_raw_parts. According to the safety section documentation of the function, data must be non-null and aligned even for zero-length slices or slices of ZSTs. Thus, passing a null pointer will lead to undefined behavior.",
  "id": "GHSA-j39j-6gw9-jw6h",
  "modified": "2026-02-04T20:36:04Z",
  "published": "2026-02-04T20:36:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rust-lang/git2-rs/issues/1211"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-lang/git2-rs/pull/1213"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-lang/git2-rs/commit/9e160f15bd056f82143109bb330573381e5de719"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rust-lang/git2-rs"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "git2 has potential undefined behavior when dereferencing Buf struct "
}


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