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

> Attackers can cause a denial of service in applications using tinytag by supplying crafted MP3 files that trigger an infinite loop during metadata parsing.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 20 Mar 2026
- **Updated:** 21 Mar 2026
- **Also known as:** GHSA-f4rq-2259-hv29, PYSEC-2026-3386

## What is CVE-2026-32889?

CVE-2026-32889 is a medium-severity denial of service vulnerability in tinytag, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### 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.

Weakness: CWE-835 (Loop with Unreachable Exit Condition)

## Which versions are affected by CVE-2026-32889?

3 open source packages ship an affected version, including tinytag. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `tinytag` | PyPI | All versions | 2.2.1 |
| `tinytag` | PyPI | All versions | 2.2.1 |
| `tinytag` | PyPI | All versions | 2.2.1 |

Products: Tinytag Tinytag.

## How do I fix CVE-2026-32889?

Upgrade tinytag to 2.2.1 or later.

## Is CVE-2026-32889 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-32889 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-32889 and fix it if it is affected.

What it is: CVE-2026-32889 is a medium-severity denial of service vulnerability in tinytag, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-32889 exists.

Affected packages and fixed versions:
- tinytag (PyPI): affected all versions; fixed in 2.2.1
- tinytag (PyPI): affected all versions; fixed in 2.2.1
- tinytag (PyPI): affected all versions; fixed in 2.2.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-32889/ (Markdown: https://insights.sbomify.com/CVE-2026-32889/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-32889
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-32889
- OSV: https://osv.dev/vulnerability/CVE-2026-32889

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-32889/
Summaries are generated and may contain mistakes; the official description above is the record.