What is CVE-2026-104266?

CVE-2026-104266 is a medium-severity vulnerability in Tinytag, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 6.5/10. Published 2026-10-15.

How severe is CVE-2026-104266?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Tinytag

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.

Published 2026-10-15.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Tinytag — versions >= 2.0.0, < 2.3.0

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

Frequently asked questions

What is CVE-2026-104266?: CVE-2026-104266 is a medium-severity vulnerability in Tinytag, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 6.5/10. Published 2026-10-15.
How severe is CVE-2026-104266?: Medium severity. CVSS v3 base score is 6.5 out of 10.