CVE-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 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.

CVSS 3.1

6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS

0.3% chance of exploitation in the next 30 days; higher than 26% of CVEs (scores of 2026-10-25)

CWE

CWE-835

Published

2026-10-15

Modified

2026-10-21

Record from

the NVD, synced 2026-10-21

Packages (OSV)

References

• https://github.com/tinytag/tinytag/commit/9ada221ba44990cb02cd9002d992186e037b515e
• https://github.com/tinytag/tinytag/pull/326
• https://github.com/tinytag/tinytag/releases/tag/2.3.0
• https://github.com/tinytag/tinytag/security/advisories/GHSA-24cc-9352-h2pg

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