CVE-2026-111075

In Eclipse OpenJ9 versions prior to 0.63.0, the JITServer component fails to perform cross-field validation on attacker-controlled `_size`, `_paddingSize`, and `_dataOffset` fields during `DataDescriptor` message deserialization. An unauthenticated remote attacker can send a crafted network payload that triggers an unsigned integer underflow in `DataDescriptor::getPayloadSize()` and `DataDescriptor::getNextDescriptor()`. This results in an out-of-bounds heap read and an immediate process crash (SIGSEGV), causing a denial of service.

CVSS 4.0

8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 30% of CVEs (scores of 2026-10-26)

CWEs

CWE-125, CWE-191

Published

2026-10-21

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

References

• https://github.com/eclipse-openj9/openj9/pull/25009
• https://gitlab.eclipse.org/security/cve-assignment/-/work_items/423
• https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/941

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