PT-2026-108059 · Pypi · Msgpack5
CVE-2026-107299
·
Published
2026-10-08
·
Updated
2026-10-08
CVSS v3.1
5.9
Medium
| Vector | AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
msgpack5 versions prior to 6.1.0
Description
The streaming decoder incorrectly treats the reserved MessagePack byte
0xc1 as incomplete input rather than invalid input. When 0xc1 begins a stream, the decoder buffers all subsequent data while waiting for bytes that cannot make the value valid, which allows a remote peer to cause memory exhaustion.Recommendations
Update to version 6.1.0.
Reject
0xc1 before streaming input to msgpack5.
Enforce stream byte and time limits.Exploit
Fix
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Weakness Enumeration
Related Identifiers
Affected Products
Msgpack5