CVE-2026-90472 msgpack-java through 0.9.12 Stack Overflow via Nested Arrays
Attackers can cause denial of service in msgpack-java by sending deeply nested arrays that trigger a stack overflow during deserialization.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-90472?
CVE-2026-90472 is a medium-severity denial of service vulnerability in msgpack-java, published on 12 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
msgpack-java through 0.9.12 contains a stack overflow vulnerability in MessageUnpacker.unpackValue() that recursively deserializes arrays and maps without nesting depth limits. Attackers can craft payloads with deeply nested arrays to exhaust the deserializing thread's stack and trigger StackOverflowError, causing per-request deserialization failures.
Weakness: CWE-674
Which versions are affected by CVE-2026-90472?
How do I fix CVE-2026-90472?
No fix has been published for CVE-2026-90472 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-90472 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90472 exists.
Sources
Also known as DEBIAN-CVE-2026-90472, GHSA-h5hr-vppv-v9cg, UBUNTU-CVE-2026-90472.