Vulnerability GHSA-qw35-55vc-rhgj
Low Risk
LOW RISK
CVSS Score: 3.7
Score Range: < 4.0
Low severity vulnerabilities (CVSS < 4.0). Hygiene issues that can accumulate but pose lower immediate risk.
5 hours ago
October 08, 2026 at 05:39 PM UTC
msgpack5: Decoding negative int64 values mutates the input buffer
1.0.0 - 6.0.2
1.0.0 - 6.0.2
Summary
msgpack5: Decoding negative int64 values mutates the input buffer
Details
Impact
Decoding a negative signed 64-bit integer modifies the corresponding bytes in the caller-provided input buffer. Applications that retain or reuse encoded input for integrity checks, logging, or subsequent processing may observe silently corrupted data.
Positive integers and other MessagePack value types are not affected.
Patches
The decoder now computes signed 64-bit values without writing to the input buffer.
Workarounds
Copy untrusted MessagePack input before decoding it, or do not retain or reuse input buffers after decoding.
Related Vulnerabilities
Other vulnerabilities affecting the same packages
High Risk
5 hours ago
msgpack5: Truncated map32 headers throw an unexpected error
1.0.0 - 6.0.2 GHSA-8f34-f56x-9xph
1.0.0 - 6.0.2 GHSA-8f34-f56x-9xph
Medium Risk
5 hours ago
msgpack5: Deeply nested input can exhaust the decoder stack
1.0.0 - 6.0.2 GHSA-24ch-f2g6-9hhh
1.0.0 - 6.0.2 GHSA-24ch-f2g6-9hhh
Medium Risk
5 hours ago
msgpack5: Quadratic parsing in the streaming decoder
1.0.0 - 6.0.2 GHSA-gcx5-hxj7-gpqq
1.0.0 - 6.0.2 GHSA-gcx5-hxj7-gpqq
Medium Risk
5 years ago
Prototype poisoning
1.0.0 - 3.6.0 and 4.0.0 - 4.5.0 and 5.0.0 - 5.2.0 GHSA-gmjw-49p4-pcfm
1.0.0 - 3.6.0 and 4.0.0 - 4.5.0 and 5.0.0 - 5.2.0 GHSA-gmjw-49p4-pcfm
Impacted packages
Timeline
Published
5 hours ago
October 08, 2026 at 05:39 PM UTC
Fixed (6.1.0)
Unknown
Unknown
Last Modified
5 hours ago
October 08, 2026 at 05:45 PM UTC