CVE-2026-21452
unknown
CVSS v3
—
CVSS v4 NEW
—
VIR risk
—
Description
MessagePack for Java Vulnerable to Remote DoS via Malicious EXT Payload Allocation
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | affected | |
| debian | sid | affected | |
| debian | trixie | affected | |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Maven | org.msgpack:msgpack-core | <0.9.11 | 0.9.11 |
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
- https://github.com/msgpack/msgpack-java
- https://github.com/msgpack/msgpack-java/releases/tag/v0.9.11
- https://security-tracker.debian.org/tracker/CVE-2026-21452
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.