vulnerability · Thu 08 Oct 2026 · 17:40 UTC
GHSA-5x5g-h9x8-2fh9: msgpack5: Many buffered values can exhaust the streaming decoder stack
Filed UTCSource GTH ↗
The streaming decoder recursively invokes itself for every complete value remaining in a chunk. A single chunk containing many small valid MessagePack values can exhaust the JavaScript call stack and interrupt the process or stream. ### Patches The streaming decoder now drains concatenated values iteratively with constant call-stack depth. ### Workarounds Limit the number of MessagePack values accepted in one chunk, or split large batches before passing them to the decoder stream.
Signals
as the pipeline stamped them- High
- High-risk vulnerability — CVSS 7.5
CVE
KEV from CISA · EPSS from FIRST| Id | KEV | EPSS | Reference |
|---|---|---|---|
| CVE-2026-107300 | — | 0.43% | NVD ↗ |
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