{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.003"
              },
              {
                "fixed": "1.004"
              },
              {
                "introduced": "1.034"
              },
              {
                "fixed": "1.035"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0d1baac8f8b1d3f15a77cc907f7cebccf74b9176"
            },
            {
              "fixed": "396eb238f041bfe959fe5bbe86e97af107d2276e"
            },
            {
              "introduced": "289518caad4149b3019e6fc865d669239b96ccbf"
            },
            {
              "fixed": "f6a3d06f24ac8ec0693721decbc1cddcd0d35a41"
            }
          ],
          "repo": "https://github.com/tonycoz/imager",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-jhx5-34j8-9g88"
  ],
  "database_specific": {
    "cna_assigner": "CPANSec",
    "cwe_ids": [
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73639.json"
  },
  "details": "Imager::File::PNG versions from 1.003 before 1.004 for Perl write past the end of the row buffer reading a PNG with a tRNS transparency chunk in read_direct8.\n\nWith a tRNS chunk, read_direct8() adds an alpha channel to the image it creates but still sizes the row buffer from the original channel count. libpng expands the transparency into that extra channel, so png_read_row() fills one channel more than the buffer holds, at one byte per sample, and writes width bytes past the end of the allocation. Palette images go to read_paletted() and 16-bit images to read_direct16(), which sizes its buffer from png_get_rowbytes() and allocates enough for the expanded row.\n\nThe same reader ships bundled in the Imager distribution.\n\nReading an attacker-supplied PNG through Imager-\u003eread() corrupts the heap, which can crash the process.",
  "id": "CVE-2026-73639",
  "modified": "2026-09-20T11:31:00.998157893Z",
  "published": "2026-09-17T21:18:59.207Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/17/6"
    },
    {
      "type": "WEB",
      "url": "https://cpan.org/modules"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73639.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/tonycoz/imager/security/advisories/GHSA-jhx5-34j8-9g88"
    },
    {
      "type": "ADVISORY",
      "url": "https://metacpan.org/release/TONYC/Imager-1.035/changes"
    },
    {
      "type": "ADVISORY",
      "url": "https://metacpan.org/release/TONYC/Imager-File-PNG-1.004/changes"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73639"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/tonycoz/imager/pull/567"
    },
    {
      "type": "FIX",
      "url": "https://github.com/tonycoz/imager/commit/d973bd7e8843f084e8071caa24b89545c88b1e4b.patch"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tonycoz/imager"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "Imager::File::PNG versions from 1.003 before 1.004 for Perl write past the end of the row buffer reading a PNG with a tRNS transparency chunk in read_direct8"
}