Vulnerability-Lookup

FKIE_CVE-2026-73639

Vulnerability from fkie_nvd - Published: 2026-09-17 22:17 - Updated: 2026-09-18 01:16

Severity

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. With 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. The same reader ships bundled in the Imager distribution. Reading an attacker-supplied PNG through Imager->read() corrupts the heap, which can crash the process.

References

	URL	Tags
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/tonycoz/imager/commit/d973bd7e8843f084e8071caa24b89545c88b1e4b.patch
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/tonycoz/imager/pull/567
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/tonycoz/imager/security/advisories/GHSA-jhx5-34j8-9g88
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/TONYC/Imager-1.035/changes
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/TONYC/Imager-File-PNG-1.004/changes
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/09/17/6

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "Imager::File::PNG"
          ],
          "packageName": "Imager-File-PNG",
          "packageURL": "pkg:cpan/Imager-File-PNG",
          "programFiles": [
            "impng.c"
          ],
          "programRoutines": [
            {
              "name": "read_direct8"
            }
          ],
          "repo": "https://github.com/tonycoz/imager",
          "versions": [
            {
              "lessThan": "1.004",
              "status": "affected",
              "version": "1.003",
              "versionType": "custom"
            }
          ]
        },
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "Imager::File::PNG"
          ],
          "packageName": "Imager",
          "packageURL": "pkg:cpan/Imager",
          "programFiles": [
            "PNG/impng.c"
          ],
          "programRoutines": [
            {
              "name": "read_direct8"
            }
          ],
          "repo": "https://github.com/tonycoz/imager",
          "versions": [
            {
              "lessThan": "1.035",
              "status": "affected",
              "version": "1.034",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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",
  "lastModified": "2026-09-18T01:16:56.010",
  "metrics": {},
  "published": "2026-09-17T22:17:03.763",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://github.com/tonycoz/imager/commit/d973bd7e8843f084e8071caa24b89545c88b1e4b.patch"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://github.com/tonycoz/imager/pull/567"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://github.com/tonycoz/imager/security/advisories/GHSA-jhx5-34j8-9g88"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://metacpan.org/release/TONYC/Imager-1.035/changes"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://metacpan.org/release/TONYC/Imager-File-PNG-1.004/changes"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/17/6"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}

CVE-2026-73639 (GCVE-0-2026-73639)

Vulnerability from cvelistv5 – Published: 2026-09-17 21:18 – Updated: 2026-09-18 00:18

Title

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

Summary

Severity

No CVSS data available.

CWE

CWE-787 - Out-of-bounds Write

Assigner

CPANSec redhat root

References

6 references

URL	Tags
https://github.com/tonycoz/imager/security/adviso…	vendor-advisory
https://github.com/tonycoz/imager/commit/d973bd7e…	patch
https://github.com/tonycoz/imager/pull/567	issue-tracking
https://metacpan.org/release/TONYC/Imager-File-PN…	release-notes
https://metacpan.org/release/TONYC/Imager-1.035/changes	release-notes
http://www.openwall.com/lists/oss-security/2026/09/17/6

Impacted products

2 products

Vendor	Product	Version
		Affected: 1.003 , < 1.004 (custom)
		Affected: 1.034 , < 1.035 (custom)

Credits

Alexander Bluhm (bluhm)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-09-18T00:18:32.862Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/09/17/6"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "Imager::File::PNG"
          ],
          "packageName": "Imager-File-PNG",
          "packageURL": "pkg:cpan/Imager-File-PNG",
          "programFiles": [
            "impng.c"
          ],
          "programRoutines": [
            {
              "name": "read_direct8"
            }
          ],
          "repo": "https://github.com/tonycoz/imager",
          "versions": [
            {
              "lessThan": "1.004",
              "status": "affected",
              "version": "1.003",
              "versionType": "custom"
            }
          ]
        },
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "Imager::File::PNG"
          ],
          "packageName": "Imager",
          "packageURL": "pkg:cpan/Imager",
          "programFiles": [
            "PNG/impng.c"
          ],
          "programRoutines": [
            {
              "name": "read_direct8"
            }
          ],
          "repo": "https://github.com/tonycoz/imager",
          "versions": [
            {
              "lessThan": "1.035",
              "status": "affected",
              "version": "1.034",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Alexander Bluhm (bluhm)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "CWE-787 Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T21:18:59.207Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/tonycoz/imager/security/advisories/GHSA-jhx5-34j8-9g88"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/tonycoz/imager/commit/d973bd7e8843f084e8071caa24b89545c88b1e4b.patch"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/tonycoz/imager/pull/567"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/TONYC/Imager-File-PNG-1.004/changes"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/TONYC/Imager-1.035/changes"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to Imager-File-PNG 1.004 or later, or to Imager 1.035 or later if the bundled copy is in use."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-08-19T00:00:00.000Z",
          "value": "Imager-File-PNG 1.004 and Imager 1.035 released with fix."
        }
      ],
      "title": "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",
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-73639",
    "datePublished": "2026-09-17T21:18:59.207Z",
    "dateReserved": "2026-08-13T12:51:42.912Z",
    "dateUpdated": "2026-09-18T00:18:32.862Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.