{
   "document": {
      "category": "csaf_security_advisory",
      "csaf_version": "2.0",
      "distribution": {
         "tlp": {
            "label": "WHITE",
            "url": "https://www.first.org/tlp/"
         }
      },
      "lang": "en",
      "notes": [
         {
            "category": "description",
            "text": "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->read() corrupts the heap, which can crash the process.",
            "title": "Vulnerability Description"
         }
      ],
      "publisher": {
         "category": "other",
         "contact_details": "gdt@cpan.org",
         "name": "giterlizzi",
         "namespace": "https://github.com/giterlizzi/"
      },
      "references": [
         {
            "category": "self",
            "summary": "CPANSA-Imager-File-PNG-2026-73639 JSON",
            "url": "https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-imager-file-png-2026-73639.json"
         },
         {
            "category": "external",
            "summary": "https://github.com/tonycoz/imager/commit/d973bd7e8843f084e8071caa24b89545c88b1e4b.patch",
            "url": "https://github.com/tonycoz/imager/commit/d973bd7e8843f084e8071caa24b89545c88b1e4b.patch"
         },
         {
            "category": "external",
            "summary": "https://github.com/tonycoz/imager/pull/567",
            "url": "https://github.com/tonycoz/imager/pull/567"
         },
         {
            "category": "external",
            "summary": "https://github.com/tonycoz/imager/security/advisories/GHSA-jhx5-34j8-9g88",
            "url": "https://github.com/tonycoz/imager/security/advisories/GHSA-jhx5-34j8-9g88"
         },
         {
            "category": "external",
            "summary": "https://metacpan.org/release/TONYC/Imager-1.035/changes",
            "url": "https://metacpan.org/release/TONYC/Imager-1.035/changes"
         },
         {
            "category": "external",
            "summary": "https://metacpan.org/release/TONYC/Imager-File-PNG-1.004/changes",
            "url": "https://metacpan.org/release/TONYC/Imager-File-PNG-1.004/changes"
         },
         {
            "category": "external",
            "summary": "http://www.openwall.com/lists/oss-security/2026/09/17/6",
            "url": "http://www.openwall.com/lists/oss-security/2026/09/17/6"
         },
         {
            "category": "external",
            "summary": "CVE-2026-73639 (NVD)",
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73639"
         }
      ],
      "title": "Imager-File-PNG vulnerability",
      "tracking": {
         "current_release_date": "2026-09-17T00:00:00",
         "generator": {
            "engine": {
               "name": "CSAF Perl Toolkit",
               "version": "0.26"
            }
         },
         "id": "CPANSA-Imager-File-PNG-2026-73639",
         "initial_release_date": "2026-09-17T00:00:00",
         "revision_history": [
            {
               "date": "2026-09-17T00:00:00",
               "number": "1",
               "summary": "First release"
            }
         ],
         "status": "final",
         "version": "1"
      }
   },
   "product_tree": {
      "branches": [
         {
            "branches": [
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/>=1.003|<1.004",
                  "product": {
                     "name": "Imager-File-PNG greater than or equal 1.003 and less than 1.004",
                     "product_id": "CSAFPID-0001",
                     "product_identification_helper": {
                        "purl": "pkg:cpan/Imager-File-PNG"
                     }
                  }
               },
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/>=1.004",
                  "product": {
                     "name": "Imager-File-PNG greater than or equal 1.004",
                     "product_id": "CSAFPID-0002",
                     "product_identification_helper": {
                        "purl": "pkg:cpan/Imager-File-PNG"
                     }
                  }
               }
            ],
            "category": "product_name",
            "name": "Imager-File-PNG"
         }
      ]
   },
   "vulnerabilities": [
      {
         "cve": "CVE-2026-73639",
         "cwe": {
            "id": "CWE-787",
            "name": "Out-of-bounds Write"
         },
         "notes": [
            {
               "category": "description",
               "text": "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->read() corrupts the heap, which can crash the process.",
               "title": "Vulnerability Description"
            }
         ],
         "product_status": {
            "fixed": [
               "CSAFPID-0002"
            ],
            "known_affected": [
               "CSAFPID-0001"
            ]
         },
         "scores": [
            {
               "cvss_v3": {
                  "baseScore": 9.1,
                  "baseSeverity": "CRITICAL",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                  "version": "3.1"
               },
               "products": [
                  "CSAFPID-0001"
               ]
            }
         ]
      }
   ]
}