GHSA-26WQ-P25C-J6FV msgpack5: Reserved byte can cause unbounded stream buffering

Impact The reserved MessagePack byte 0xc1 is incorrectly treated as incomplete input. When it appears at the start of a decoder stream, all subsequent data is retained while the decoder waits for bytes that can never make the value valid, allowing memory exhaustion. Patches The decoder now reject...

NPM: msgpack5: Reserved byte can cause unbounded stream buffering

NPM: msgpack5: Reserved byte can cause unbounded stream buffering vulnerability discovered by ? in WordPress Npm msgpack5 versions 6.1.0...

CVE-2026-107299 msgpack5: Reserved byte can cause unbounded stream buffering

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...