Source: python-msgpack
Version: 1.1.2-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>

Hi,

The following vulnerability was published for python-msgpack.

CVE-2026-57585[0]:
| MessagePack is the serializer implementation for Python msgpack.org.
| Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker
| reuse after a caught error, potentially leading to a DoS attack.  If
| the Unpacker is used repeatedly after an error occurs, the process
| may crash with a SEGV. This issue has been fixed in version 1.2.1.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-57585
    https://www.cve.org/CVERecord?id=CVE-2026-57585
[1] 
https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964
[2] 
https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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