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MediumFix available

tinytag: Infinite loop when parsing certain M4A files containing invalid atoms

Type: advisorySources: OSV

### Impact An M4A file containing a sub-atom with a size of zero in the `----` atom makes the parser enter an infinite loop, resulting in a denial-of-service for programs reading such files with tinytag. ### Patches The issue has been fixed in tinytag 2.3.0, by reusing the primary atom parsing code path that contains appropriate size checks. ### Workarounds No workarounds exist. Users must upgrade to tinytag 2.3.0.

Products
tinytag
Affected versions
2.0.0, 2.1.0, 2.1.1, 2.1.2, 2.2.0, 2.2.1
Fixed versions
2.3.0
CVEs
CVE-2026-104266
Confirmed fixed CVEs
Not specified
Updated in this feed
30 Oct 2026, 19:14 UTC · Revision 1

Source evidence

tinytag: Infinite loop when parsing certain M4A files containing invalid atoms

core-osv · Original source

Published 15 Oct 2026, 20:16 UTC

### Impact An M4A file containing a sub-atom with a size of zero in the `----` atom makes the parser enter an infinite loop, resulting in a denial-of-service for programs reading such files with tinytag. ### Patches The issue has been fixed in tinytag 2.3.0, by reusing the primary atom parsing code path that contains appropriate size checks. ### Workarounds No workarounds exist. Users must upgrade to tinytag 2.3.0.

osv:GHSA-24cc-9352-h2pg

tinytag

Fixed versions: 2.3.0

Complete source record
{
  "id": "1270fbe0e1a2b56c646d4a15c4de2f3475579a645471c6b189ad6f95c44b5f8f",
  "url": "https://osv.dev/vulnerability/GHSA-24cc-9352-h2pg",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tinytag: Infinite loop when parsing certain M4A files containing invalid atoms",
    "summary": "### Impact An M4A file containing a sub-atom with a size of zero in the `----` atom makes the parser enter an infinite loop, resulting in a denial-of-service for programs reading such files with tinytag. ### Patches The issue has been fixed in tinytag 2.3.0, by reusing the primary atom parsing code path that contains appropriate size checks. ### Workarounds No workarounds exist. Users must upgrade to tinytag 2.3.0.",
    "evidence": "osv:GHSA-24cc-9352-h2pg",
    "products": [
      {
        "name": {
          "value": "tinytag",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.3.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "2.0.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.1.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.1.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.1.2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.2.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.2.1",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-24cc-9352-h2pg",
      "aliases": [
        "CVE-2026-104266",
        "GHSA-24cc-9352-h2pg"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.0.0"
                },
                {
                  "fixed": "2.3.0"
                }
              ]
            }
          ],
          "package": {
            "name": "tinytag",
            "purl": "pkg:pypi/tinytag",
            "ecosystem": "PyPI"
          },
          "versions": [
            "2.0.0",
            "2.1.0",
            "2.1.1",
            "2.1.2",
            "2.2.0",
            "2.2.1"
          ],
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-24cc-9352-h2pg/GHSA-24cc-9352-h2pg.json"
          }
        }
      ],
      "modified": "2026-10-15T20:30:05.136549303Z",
      "provider": "osv",
      "references": [
        "https://github.com/tinytag/tinytag/security/advisories/GHSA-24cc-9352-h2pg",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-104266",
        "https://github.com/tinytag/tinytag/pull/326",
        "https://github.com/tinytag/tinytag/commit/9ada221ba44990cb02cd9002d992186e037b515e",
        "https://github.com/tinytag/tinytag",
        "https://github.com/tinytag/tinytag/releases/tag/2.3.0"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-835"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-15T18:17:22Z",
        "github_reviewed_at": "2026-10-15T20:16:47Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-104266",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 336042,
  "published_at": "2026-10-15T20:16:47+00:00"
}