# msgpack (PyPI) vulnerabilities

2 known vulnerabilities (2 high), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: 1.2.4 (Oct 26, 2026): no advisory affects it
- Newest unaffected release: 1.2.4 (Oct 26, 2026), the latest release
- Weekly downloads: 56.4M
- Dependents: 17.1K
- Releases: 36 since 0.5.0 (Jan 6, 2018)
- Registry: https://pypi.org/project/msgpack/
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-114613: 0.5.0 to 1.2.2 (1.2.3 is outside it)
- CVE-2026-57585: 0.5.0 to 1.2.0 (1.2.1 is outside it)

## Advisories (2)

### [CVE-2026-114613](https://cve.now/CVE-2026-114613): MessagePack: Unbounded memory leak in msgpack C extension on strict\_map\_key validation failure

- Severity: High 7.5
- Published: Oct 22, 2026
- Affected: fixed in 1.2.3.
- Fixed in 1.2.3 (released Sep 29, 2026, 23 days before disclosure).
- The latest release, 1.2.4, is not affected.

### [CVE-2026-57585](https://cve.now/CVE-2026-57585): MessagePack: Out-of-bounds read/crash on Unpacker reuse after caught error

- Severity: High 7.5
- Published: Jun 30, 2026
- Affected: fixed in 1.2.1.
- Fixed in 1.2.1 (released Jun 18, 2026, 12 days before disclosure).
- The latest release, 1.2.4, is not affected.

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