Buffer overflow in Red Hat Enterprise Linux 10
CVE-2026-121997
A heap buffer overflow in gdbserver's QTDPsrc packet handler allows an unauthenticated remote attacker to achieve native code execution in the gdbserver process. The vulnerability results from a mismatch between a packet's declared source length and the actual data length, causing hex2bin to write beyond the allocated heap buffer.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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)
References
- access.redhat.com/security/cve/CVE-2026-121997 (vdb-entry)
- RHBZ#2565679 (issue-tracking)
Frequently asked questions
- What is CVE-2026-121997?
- CVE-2026-121997 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Heap-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-11-05.
- How severe is CVE-2026-121997?
- High severity. CVSS v3 base score is 8.1 out of 10.