CVE-2026-107302 — msgpack5 is a msgpack v5 implementation for node.js and the browser.
Description
msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the decoder reads the four-byte length of a map32 value before validating that the complete five-byte header is available. A truncated map32 header therefore causes a checked out-of-bounds buffer read and throws RangeError instead of IncompleteBufferError, which can unexpectedly terminate a request, stream, or worker in applications that wait for additional bytes after IncompleteBufferError. There is no adjacent-memory disclosure because the buffer implementation checks bounds. This issue is fixed in version 6.1.0.
CVSS v3.1 base metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HHigh severity
Band computed from the CVSS base score, not the source's own label — so it means the same thing across every feed.
AV
Network
Attack Vector
AC
Low
Attack Complexity
PR
None
Privileges Required
UI
None
User Interaction
S
Unchanged
Scope
C
None
Confidentiality
I
None
Integrity
A
High
Availability
Affected
- Vendor
- npm
- Product
- msgpack5
Versions
- pkg:npm/msgpack5 < 6.1.0
Stated as the source expressed them.
References
- advisory[email protected]https://github.com/mcollina/msgpack5/commit/15443a1f2aa682a6aa37f1705ac628de5b866ad1
- advisory[email protected]https://github.com/mcollina/msgpack5/releases/tag/v6.1.0
- advisory[email protected]https://github.com/mcollina/msgpack5/security/advisories/GHSA-8f34-f56x-9xph
- advisoryOSV GHSA-8f34-f56x-9xphhttps://osv.dev/vulnerability/GHSA-8f34-f56x-9xph
- vendorOSV packagehttps://github.com/mcollina/msgpack5
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