Fix CVE(s): CVE-2026-40930

{
  "id": "10d074b716ef21a6ad35cb3c3b2e459a7c150b0c3c4737d5e55c22739ab1dca6",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1788344031",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Fix CVE(s): CVE-2026-40930",
    "summary": "* SECURITY UPDATE: chunk data smuggling in the APNG push-mode reader - debian/patches/CVE-2026-40930.patch: consume the chunk body and the CRC field in the three inter-frame discard paths of png_push_read_chunk (pngpread.c), so that bytes inside an ignored chunk are no longer reinterpreted as a fresh chunk header on the next png_process_data call, and pass the real chunk length to png_ensure_sequence_number in png_push_read_IDAT (pngpread.c), so that an fdAT chunk shorter than its own sequence number no longer underflows idat_size and swallows the rest of the stream as frame data - CVE-2026-40930",
    "evidence": "osv:CLSA-2026-1788344031",
    "products": [
      {
        "name": {
          "value": "libpng-dev",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.37-2+tuxcare.els5",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libpng-tools",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.37-2+tuxcare.els5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libpng16-16",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.37-2+tuxcare.els5",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1788344031",
      "aliases": [
        "CLSA-2026-1788344031"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.37-2+tuxcare.els5"
                }
              ]
            }
          ],
          "package": {
            "name": "libpng-dev",
            "purl": "pkg:deb/tuxcare/libpng-dev?distro=ubuntu-20.04",
            "ecosystem": "TuxCare:Ubuntu:20.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1788344031.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.37-2+tuxcare.els5"
                }
              ]
            }
          ],
          "package": {
            "name": "libpng-tools",
            "purl": "pkg:deb/tuxcare/libpng-tools?distro=ubuntu-20.04",
            "ecosystem": "TuxCare:Ubuntu:20.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1788344031.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.37-2+tuxcare.els5"
                }
              ]
            }
          ],
          "package": {
            "name": "libpng16-16",
            "purl": "pkg:deb/tuxcare/libpng16-16?distro=ubuntu-20.04",
            "ecosystem": "TuxCare:Ubuntu:20.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1788344031.json"
          }
        }
      ],
      "modified": "2026-10-26T09:30:09.192082477Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-40930"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1788344031.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40930"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-40930",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 446869,
  "published_at": "2026-09-02T10:14:03+00:00"
}