CVE-2026-107298: medium-severity vulnerability in mcollina msgpack5
msgpack5: Deeply nested input can exhaust the decoder stack
Published
10Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3
exploitation probability
—
observed exploitation
nono source reports it
msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the array and map decoding paths have no nesting-depth limit, allowing an attacker who can provide MessagePack input to submit deeply nested containers that exhaust the JavaScript call stack and interrupt a process, worker, or request handler. This issue is fixed in version 6.1.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
mcollina · msgpack5Related CVEs — mcollina msgpack5
In the same product, most dangerous first.
CVE-2021-21368MEDIUMPrototype poisoningEPSS 1.6%CVE-2026-107302HIGHmsgpack5: Truncated map32 headers throw an unexpected errorEPSS —CVE-2026-107301MEDIUMmsgpack5: Partial options disable prototype protectionEPSS —CVE-2026-107300HIGHmsgpack5: Many buffered values can exhaust the streaming decoder stackEPSS —CVE-2026-107299MEDIUMmsgpack5: Reserved byte can cause unbounded stream bufferingEPSS —CVE-2026-107297MEDIUMmsgpack5: Quadratic parsing in the streaming decoderEPSS —