high7.5
CVE-2026-107302
msgpack5 is a msgpack v5 implementation for node.js and the browser.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | msgpack5 | >= 4.1.0, < 6.1.0 | 6.1.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-8f34-f56x-9xph
- https://github.com/mcollina/msgpack5/security/advisories/GHSA-8f34-f56x-9xph
- https://github.com/mcollina/msgpack5/commit/15443a1f2aa682a6aa37f1705ac628de5b866ad1
- https://github.com/mcollina/msgpack5/releases/tag/v6.1.0
- https://nvd.nist.gov/vuln/detail/CVE-2026-107302