Is org.msgpack:msgpack-core affected by CVE-2026-21452?

Maven org.msgpack:msgpack-core is affected in <0.9.11.

Is CVE-2026-21452 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

high

CVE-2026-21452

Q: Is CVE-2026-21452 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

Maven · org.msgpack:msgpack-core

Summary

MessagePack for Java Vulnerable to Remote DoS via Malicious EXT Payload Allocation

Severity: high
EPSS: 0.5% (p42)
Also known as: GHSA-cw39-r4h6-8j3x
Published: 2026-01-05

References

https://github.com/msgpack/msgpack-java/security/advisories/GHSA-cw39-r4h6-8j3x
https://nvd.nist.gov/vuln/detail/CVE-2026-21452
https://github.com/msgpack/msgpack-java/commit/daa2ea6b2f11f500e22c70a22f689f7a9debdeae

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.