Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Msgpack | Messagepack | < 1.2.1 |
Related Weaknesses (CWE)
References
- https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d1Patch
- https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-896MitigationVendor Advisory
FAQ
What is CVE-2026-57585?
CVE-2026-57585 is a vulnerability with a CVSS score of 7.5 (HIGH). 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. ...
How severe is CVE-2026-57585?
CVE-2026-57585 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-57585?
Check the references section above for vendor advisories and patch information. Affected products include: Msgpack Messagepack.