CVE-2026-107299

Published: Oct 8, 2026Modified: Oct 9, 2026Deferred

5.9

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 2.2 / Impact: 3.6

Source: security-advisories@github.com (Secondary)

Description

msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder treats the reserved MessagePack byte 0xc1 as incomplete input instead of invalid input. When 0xc1 begins a stream, subsequent data remains buffered while the decoder waits for bytes that cannot make the value valid, allowing a remote peer to exhaust memory. This issue is fixed in version 6.1.0.

Related CWEs

CWE-228

Improper Handling of Syntactically Invalid Structure

The product does not handle or incorrectly handles input that is not syntactically well-formed with respect to the associated specification.

References (3)

https://github.com/mcollina/msgpack5/commit/85da345bf1acc18ca441741e5cf4aa0ed0d69314

Source: security-advisories@github.com

https://github.com/mcollina/msgpack5/releases/tag/v6.1.0

Source: security-advisories@github.com

https://github.com/mcollina/msgpack5/security/advisories/GHSA-26wq-p25c-j6fv

Source: security-advisories@github.com

Timeline

No history available yet.