Integer Overflow or Wraparound Affecting org.msgpack:msgpack-core package, versions [0,]
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-ORGMSGPACK-19778373
- published14 Sept 2026
- disclosed12 Sept 2026
- creditWayde Shi
Introduced: 12 Sep 2026
NewCVE-2026-90473 (opens in a new tab)How to fix?
There is no fixed version for org.msgpack:msgpack-core.
Overview
Affected versions of this package are vulnerable to Integer Overflow or Wraparound via MessageUnpacker.skipValue() in msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java. An attacker can desynchronize the parser and cause attacker-controlled data to be returned in place of later fields by supplying a MAP32 container with an element count at or above 0x40000000. This affects applications that unpack untrusted MessagePack input, where downstream code can read corrupted field values instead of the intended data.