MessagePack: Unbounded memory leak in msgpack C extension on strict_map_key validation failure
High-risk advisory
CVE-2026-114613
Summary
MessagePack: Unbounded memory leak in msgpack C extension on strict_map_key validation failure
Why it matters
GitHub has published a reviewed security advisory for msgpack. Prioritize it with other application dependency updates, especially because EPSS places it in the 38% percentile.
Operator check
Check whether msgpack is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.4%; percentile: 38%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.