PyPI/msgpack CVE-2026-57585: high 7.5, EPSS 0.49%
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. I
Action: Upgrade msgpack to 1.2.1 or later.
pip install msgpack==1.2.1Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 1.2.1 | - |
Fixed versions
| 1.2.1 |
Sources
- osv: PYSEC-2026-3625
- https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964
- https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d
CVE-2026-57585 · published · modified · JSON