Vulnerability in Red Hat Enterprise Linux 10

CVE-2026-121996

A length validation flaw in gdbserver's agent-expression parser allows an unauthenticated remote attacker to read uninitialized heap memory from the gdbserver process and cause a denial of service. Disclosed heap content includes addresses suitable for defeating ASLR in further exploitation.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (41.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-121996?
CVE-2026-121996 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Untrusted Pointer Dereference. CVSS score: 8.2/10. Published 2026-11-05.
How severe is CVE-2026-121996?
High severity. CVSS v3 base score is 8.2 out of 10.