CVE-2026-104266
tinytag is a Python library for reading audio file metadata.
Published Oct 15, 2026 · corrected/updated Oct 15, 2026 · evidence confidence high
tinytag is a Python library for reading audio file metadata. From 2.0.0 until 2.3.0, an M4A file containing a sub-atom with a size of zero inside a ---- atom can cause the metadata parser to stop advancing through the input. The custom-field atom traversal repeatedly processes the malformed location, causing an infinite loop and denying service to a program that reads the crafted file. This issue is fixed in version 2.3.0.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-104266 is a medium public vulnerability record for this product. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether this product is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: tinytag (2.0.0 → 2.3.0); tinytag (>= 2.0.0, < 2.3.0); tinytag. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 6.5, EPSS 0.3%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-835. Sources contributing to this record: cve_org, epss, github, gitlab. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Oct 15, 2026 · NIST NVD
Detected
tinytag is a Python library for reading audio file metadata. From 2.0.0 until 2.3.0, an M4A file containing a sub-atom with a size of zero inside a ---- atom can cause the metadata parser to stop advancing through the input. The custom-field atom traversal repeatedly processes the malformed location, causing an infinite loop and denying service to a program that reads the crafted file. This issue
Oct 15, 2026 · GitHub Advisory Database
Fix available
tinytag fixed in 2.3.0
Oct 15, 2026 · GitHub Advisory Database
Fix available
tinytag fixed in 2.3.0
Oct 15, 2026 · GitHub Advisory Database
Updated
### 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 tin
Affected
- PyPI tinytag2.0.0 → 2.3.0
- pip tinytag>= 2.0.0, < 2.3.0
- pypi tinytagversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-104266
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-104266
30-day exploitation probability 0.3%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-24cc-9352-h2pg
GitHub Advisory Database record mirrored by OSV.
github.com - GitLab Advisory DatabasePackage advisoryCVE-2026-104266
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.
advisories.gitlab.com - NIST NVDVulnerability recordCVE-2026-104266
tinytag is a Python library for reading audio file metadata. From 2.0.0 until 2.3.0, an M4A file containing a sub-atom with a size of zero inside a ---- atom can cause the metadata parser to stop advancing through the input. The custom-field atom traversal repeatedly processes th
nvd.nist.gov - OSV.devPackage advisoryGHSA-24cc-9352-h2pg
tinytag: Infinite loop when parsing certain M4A files containing invalid atoms
osv.dev