CVE-2026-90560 zstd-jni 1.2.0 through 1.5.7-13 Out-of-Bounds Read via ZstdDictDecompress
Attackers can trigger an out-of-bounds read in zstd-jni by supplying invalid offsets, potentially causing JVM termination or memory disclosure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90560?
CVE-2026-90560 is a high-severity memory corruption vulnerability in luben zstd-jni, published on 12 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
zstd-jni versions 1.2.0 through 1.5.7-13 contain an out-of-bounds read vulnerability in the ZstdDictDecompress constructor because offset and length arguments are never validated against the dictionary array bounds. Attackers can supply arbitrary offset or length values to read memory past the end of the supplied array, potentially causing JVM termination.
Weakness: CWE-125
Which versions are affected by CVE-2026-90560?
How do I fix CVE-2026-90560?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-90560 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90560 exists.
Sources
Also known as CLEANSTART-2026-OH53916, CLEANSTART-2026-PB88860, CLEANSTART-2026-UX53854, CLEANSTART-2026-WJ34335, CLEANSTART-2026-YH52150, CLEANSTART-2026-YT94531 and 3 more.