Vulnerability · Published Nov 5, 2026 · Assigned by redhat
CVE-2026-123151Gdb: gdb: stack buffer overflow in parse_tsv_definition via stale rs->buf tail
High 7.5
In plain English
A high-severity stack buffer overflow in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 56.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A flaw was found in the GNU debugger (GDB). When GDB connects to a remote debug target, a malicious target can cause GDB to overflow a buffer on the stack while parsing the target's replies. This can crash GDB or potentially allow the target to execute arbitrary code in the GDB client process with the privileges of the user running GDB.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | gdb | no fix listed | DEBIAN-CVE-2026-123151 |
| Debian:13 | gdb | no fix listed | DEBIAN-CVE-2026-123151 |
| Debian:14 | gdb | no fix listed | DEBIAN-CVE-2026-123151 |
| Ubuntu:22.04:LTS | gdb | no fix listed | UBUNTU-CVE-2026-123151 |
| Ubuntu:24.04:LTS | gdb | no fix listed | UBUNTU-CVE-2026-123151 |
| Ubuntu:26.04:LTS | gdb | no fix listed | UBUNTU-CVE-2026-123151 |
| Ubuntu:26.10 | gdb | no fix listed | UBUNTU-CVE-2026-123151 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Hardened Images | see references |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-123151 vdb-entry, x_refsource_REDHAT
- RHBZ#2567333 issue-tracking, x_refsource_REDHAT