Medium 6.5Published Oct 15, 2026

CVE-2026-104266tinytag: Infinite loop when parsing certain M4A files containing invalid atoms

Updated under an hour ago (2026-10-19 09:20 UTC)

Does this affect you?

It affects tinytag. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for tinytag

Exploited in the last 30 days

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: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-835
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

tinytag tinytag tinytag:tinytag (from the name)	from 2.0.0, < 2.3.0	CNA record

References

https://github.com/tinytag/tinytag/security/advisories/GHSA-24cc-9352-h2pgx-refsource-confirm
https://github.com/tinytag/tinytag/pull/326x-refsource-misc
https://github.com/tinytag/tinytag/commit/9ada221ba44990cb02cd9002d992186e037b515ex-refsource-misc
https://github.com/tinytag/tinytag/releases/tag/2.3.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.