Kurz gesagt
- CVE-2026-107302 ist eine Schwachstelle (HOCH (CVSS 7.5)) in msgpack5.
- Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 0.52%, höher als bei 44.4% aller Schwachstellen.
- Abhilfe: auf 6.1.0 oder neuer aktualisieren.
| Package | Affected versions | Patched versions |
|---|
| msgpack5 npm | ≥ 4.1.0, < 6.1.0
| 6.1.0
|
Description
Impact
A truncated map32 header causes an out-of-bounds buffer read and throws RangeError instead of IncompleteBufferError. Applications that rely on IncompleteBufferError to wait for additional bytes may terminate a request, stream, or worker unexpectedly. No adjacent memory is disclosed because the buffer implementation checks bounds.
Patches
The decoder now validates the complete five-byte map32 header before reading its length and reports truncated input as IncompleteBufferError.
Workarounds
Require at least five bytes before decoding a value beginning with 0xdf, or catch RangeError and treat it as incomplete input only for truncated map32 headers.
NVD description
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.
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