Vulnerability · Published Mar 20, 2026 · Assigned by GitHub_M
CVE-2026-32889tinytag: Denial of Service via non-terminating SYLT frame parsing loop
Medium 6.5
In plain English
A medium-severity infinite loop in tinytag from tinytag. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
tinytag is a Python library for reading audio file metadata. Version 2.2.0 allows an attacker who can supply MP3 files for parsing to trigger a non-terminating loop while the library parses an ID3v2 SYLT (synchronized lyrics) frame. In server-side deployments that automatically parse attacker-supplied files, a single 498-byte MP3 can cause the parsing operation to stop making progress and remain busy until the worker or process is terminated. The root cause is that _parse_synced_lyrics assumes _find_string_end_pos always returns a position greater than the current offset. That assumption is false when no string terminator is present in the remaining frame content. This issue has been fixed in version 2.2.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | tinytag | 2.2.1 | GHSA-f4rq-2259-hv29 |
| PyPI | tinytag | 2.2.1 | PYSEC-2026-3386 |
Affected products (as reported)
Weakness: CWE-835 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- https://github.com/tinytag/tinytag/security/advisories/GHSA-f4rq-2259-hv29 x_refsource_CONFIRM
- https://github.com/tinytag/tinytag/commit/44e496310f7ced8077e9087e3774acbaa324b18a x_refsource_MISC
- https://github.com/tinytag/tinytag/commit/4d649b9c314ada8ff8a74e0469e9aadb3acb252a x_refsource_MISC
- https://github.com/tinytag/tinytag/commit/5cd321521ff097e41724b601d7e3d7adc7e53402 x_refsource_MISC