osv-2026-514
Vulnerability from osv_ossfuzz
Published
2026-04-03 00:09
Modified
2026-04-03 00:09
Summary
Heap-buffer-overflow in format_expand1
Details

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=498472071

Crash type: Heap-buffer-overflow READ 1
Crash state:
format_expand1
format_expand
format-fuzzer.c
References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "fixed_range": "dc12da45736f03205de0841175e020a27d574290:43e2942fa05fed779324fd379bb1577ef35c158d",
        "introduced_range": "6324dae114a1f8c9e1454914a70cba0ded7f5b34:a30fc69f868fa0adf85b0957fe3f67357fe73d73"
      },
      "ecosystem_specific": {
        "severity": "MEDIUM"
      },
      "package": {
        "ecosystem": "OSS-Fuzz",
        "name": "tmux",
        "purl": "pkg:generic/tmux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7620c03b7278ed631efa98455c5e116538c23ed7"
            },
            {
              "fixed": "43e2942fa05fed779324fd379bb1577ef35c158d"
            }
          ],
          "repo": "https://github.com/tmux/tmux.git",
          "type": "GIT"
        }
      ],
      "versions": []
    }
  ],
  "details": "OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=498472071\n\n```\nCrash type: Heap-buffer-overflow READ 1\nCrash state:\nformat_expand1\nformat_expand\nformat-fuzzer.c\n```\n",
  "id": "OSV-2026-514",
  "modified": "2026-04-03T00:09:42.155954Z",
  "published": "2026-04-03T00:09:42.155641Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=498472071"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "Heap-buffer-overflow in format_expand1"
}


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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.