Bug 2496020 (CVE-2026-57585) - CVE-2026-57585 msgpack: MessagePack for Python: Denial of Service via Unpacker reuse after error
Summary: CVE-2026-57585 msgpack: MessagePack for Python: Denial of Service via Unpacke...
Keywords:
Status: NEW
Alias: CVE-2026-57585
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-01 16:02 UTC by OSIDB Bzimport
Modified: 2026-08-31 10:53 UTC (History)
71 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-07-01 16:02:41 UTC 
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.
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