rustsec-2026-0008
Vulnerability from osv_rustsec
Published
2026-02-02 12:00
Modified
2026-02-05 06:08
Summary
Potential undefined behavior when dereferencing Buf struct
Details

if we dereference the Buf struct right after calling new() or default() on Buf struct, it passes Null Pointer to the unsafe function slice::from_raw_parts. Based on the safety section documentation of function, data must be non-null and aligned even for zero-length slices or slices of ZSTs. Thus, passing Null Pointer will lead to undefined behavior.

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{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption"
        ],
        "cvss": null,
        "informational": "unsound"
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "git2",
        "purl": "pkg:cargo/git2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.20.4"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "GHSA-j39j-6gw9-jw6h"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "if we dereference the Buf struct right after calling new() or default() on Buf struct, it passes Null Pointer to the unsafe function slice::from_raw_parts. Based on the safety section documentation of function,\ndata must be non-null and aligned even for zero-length slices or slices of ZSTs. Thus, passing Null Pointer will lead to undefined behavior.",
  "id": "RUSTSEC-2026-0008",
  "modified": "2026-02-05T06:08:13Z",
  "published": "2026-02-02T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/git2"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0008.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-lang/git2-rs/pull/1213"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Potential undefined behavior when dereferencing Buf struct"
}


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