libpng1.6 — security advisory

{
  "id": "11ccea3af65f2b1f685eea2203639d5f1cec9f595fa1c72fd8e3c9eb3d893c5c",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-64720",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2025-64720",
    "summary": "LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From version 1.6.0 to before 1.6.51, an out-of-bounds read vulnerability exists in png_image_read_composite when processing palette images with PNG_FLAG_OPTIMIZE_ALPHA enabled. The palette compositing code in png_init_read_transformations incorrectly applies background compositing during premultiplication, violating the invariant component ≤ alpha × 257 required by the simplified PNG API. This issue has been patched in version 1.6.51.",
    "evidence": "osv:DEBIAN-CVE-2025-64720",
    "products": [
      {
        "name": {
          "value": "libpng1.6",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.39-2+deb12u1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "1.6.39-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "libpng1.6",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.48-1+deb13u1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "1.6.48-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "libpng1.6",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.51-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "1.6.48-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.6.49-1~exp1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.6.50-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.6.50-1~exp1",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2025-64720",
      "aliases": [
        "DEBIAN-CVE-2025-64720"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.39-2+deb12u1"
                }
              ]
            }
          ],
          "package": {
            "name": "libpng1.6",
            "purl": "pkg:deb/debian/libpng1.6?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "1.6.39-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-64720.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.48-1+deb13u1"
                }
              ]
            }
          ],
          "package": {
            "name": "libpng1.6",
            "purl": "pkg:deb/debian/libpng1.6?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "1.6.48-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-64720.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.51-1"
                }
              ]
            }
          ],
          "package": {
            "name": "libpng1.6",
            "purl": "pkg:deb/debian/libpng1.6?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "1.6.48-1",
            "1.6.49-1~exp1",
            "1.6.50-1",
            "1.6.50-1~exp1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-64720.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-23T17:47:42.455276850Z",
      "provider": "osv",
      "upstream": [
        "CVE-2025-64720"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2025-64720"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2025-64720",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 418474,
  "published_at": "2025-11-25T00:15:47.46+00:00"
}