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.

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 2026-11-05 · last modified 2026-11-05.

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

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-822 — Untrusted Pointer Dereference

References

access.redhat.com/security/cve/CVE-2026-121996 (vdb-entry)
RHBZ#2565678 (issue-tracking)

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.