libheif — security advisory

{
  "id": "034d973034208ed49fb79ac08f07927529cce2ef6ad03d7f59e970dbc7e06763",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-62291",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-62291",
    "summary": "libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted image sequence with a 2x2 primary plane and a 256x256 auxiliary alpha plane can cause attacker-controlled heap corruption during a normal decode and re-encode workflow. Track_Visual::decode_next_image_sample() calls transfer_channel_from_image_as() without checking that the auxiliary alpha dimensions match the main frame. The resulting inconsistent image reaches heif_track_decode_next_image() and then heif_context_encode_image(). In unc_encoder::encode(), unc_encoder_component_interleave::encode_tile() sizes its buffer with compute_tile_data_size_bytes() using the primary dimensions but copies each component using its actual plane dimensions. The oversized alpha plane is therefore copied beyond the allocation, causing an out-of-bounds write; the inverse size mismatch can also produce an out-of-bounds read. This issue is fixed in version 1.23.1.",
    "evidence": "osv:DEBIAN-CVE-2026-62291",
    "products": [
      {
        "name": {
          "value": "libheif",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.23.1-1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "1.19.8-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.20.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.20.2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.20.2-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.21.2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.21.2-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.21.2-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.21.2-4",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2026-62291",
      "aliases": [
        "DEBIAN-CVE-2026-62291"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.23.1-1"
                }
              ]
            }
          ],
          "package": {
            "name": "libheif",
            "purl": "pkg:deb/debian/libheif?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "1.19.8-1",
            "1.20.1-1",
            "1.20.2-1",
            "1.20.2-2",
            "1.21.2-1",
            "1.21.2-2",
            "1.21.2-3",
            "1.21.2-4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-62291.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-23T17:47:34.257455736Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-62291"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-62291"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-62291",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 417686,
  "published_at": "2026-08-18T22:17:02.877+00:00"
}