CVE-2026-123151
Gdb: gdb: stack buffer overflow in parse_tsv_definition via stale rs->buf tail
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Gdb: gdb: stack buffer overflow in parse_tsv_definition via stale rs->buf tail
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.
- Record
CVE-2026-123151- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-121
- Updated
- 2026-11-06
EUVDEUVD-2026-117575
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.
- Record
EUVD-2026-117575- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-06
GitHub AdvisoriesGHSA-f82m-v9ch-rh67
A flaw was found in the GNU debugger (GDB). When GDB connects to a remote debug target, a...
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.
- Record
GHSA-f82m-v9ch-rh67- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-121
- Updated
- 2026-11-06
NVD
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.
- Record
CVE-2026-123151- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-121
- Updated
- 2026-11-05
OSVDEBIAN-CVE-2026-123151
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.
- Record
DEBIAN-CVE-2026-123151- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-06
OSVUBUNTU-CVE-2026-123151
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.
- Record
UBUNTU-CVE-2026-123151- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-07
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
gdbDebian:12 |
All versions, plus listed versions 13.1-313.2-113.2-1+hurd.315.1-115.2-1 Show 36 moreShow less15.2-2~exp116.0.90.20250111-1~exp116.0.90.20250111-1~exp216.1-116.1-216.1-2+hurd.116.2-116.2-216.2-316.2-416.2-516.2-616.2-716.2-816.3-116.3-216.3-316.3-416.3-4~bpo13+116.3-4~bpo13+216.3-516.3-5~bpo13+117.0.50.20250905-1~exp117.0.90-1~exp117.0.90-1~exp217.1-117.1-1~bpo13+117.1-217.1-317.1-417.2-117.2-1~bpo13+118.1-118.1-218.1-318.1-3~bpo13+1 |
None known |
gdbDebian:13 |
All versions, plus listed versions 16.3-116.3-216.3-316.3-416.3-4~bpo13+1 Show 17 moreShow less16.3-4~bpo13+216.3-516.3-5~bpo13+117.0.50.20250905-1~exp117.0.90-1~exp117.0.90-1~exp217.1-117.1-1~bpo13+117.1-217.1-317.1-417.2-117.2-1~bpo13+118.1-118.1-218.1-318.1-3~bpo13+1 |
None known |
gdbDebian:14 |
All versions, plus listed versions 16.3-116.3-216.3-316.3-416.3-4~bpo13+1 Show 17 moreShow less16.3-4~bpo13+216.3-516.3-5~bpo13+117.0.50.20250905-1~exp117.0.90-1~exp117.0.90-1~exp217.1-117.1-1~bpo13+117.1-217.1-317.1-417.2-117.2-1~bpo13+118.1-118.1-218.1-318.1-3~bpo13+1 |
None known |
gdbUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 7.10-1ubuntu27.10-1ubuntu37.10.1-0ubuntu17.10.90.20160215-0ubuntu27.10.90.20160220-0ubuntu1 Show 4 moreShow less7.11-0ubuntu17.11.1-0ubuntu1~16.047.11.1-0ubuntu1~16.57.11.1-0ubuntu1~16.5+esm1 |
None known |
gdbUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 8.0.1-0ubuntu18.0.1-0ubuntu28.0.1-0ubuntu38.1-0ubuntu18.1-0ubuntu2 Show 5 moreShow less8.1-0ubuntu38.1-0ubuntu3.18.1-0ubuntu3.28.1.1-0ubuntu18.1.1-0ubuntu1+esm1 |
None known |
gdbUbuntu:20.04:LTS |
All versions, plus listed versions 8.3-0ubuntu19.0.50.20191019-0ubuntu19.0.50.20191119-0ubuntu19.0.90.20191216-0ubuntu19.0.90.20200105-0ubuntu1 Show 5 moreShow less9.0.90.20200117-0ubuntu19.1-0ubuntu19.2-0ubuntu1~20.049.2-0ubuntu1~20.04.19.2-0ubuntu1~20.04.2 |
None known |
gdbUbuntu:22.04:LTS |
All versions, plus listed versions 11.1-0ubuntu211.1-0ubuntu311.2-0ubuntu112.0.50.20220217-0ubuntu112.0.90-0ubuntu112.1-0ubuntu1~22.0412.1-0ubuntu1~22.04.2 |
None known |
gdbUbuntu:24.04:LTS |
All versions, plus listed versions 14.0.50.20230907-0ubuntu114.1-0ubuntu114.1-0ubuntu215.0.50.20240219-0ubuntu115.0.50.20240320-0ubuntu115.0.50.20240403-0ubuntu115.1-1ubuntu1~24.04.1 |
None known |
gdbUbuntu:26.10 |
All versions, plus listed versions 17.1-2ubuntu117.2-1ubuntu1 |
None known |
gdbUbuntu:26.04:LTS |
All versions, plus listed versions 16.3-1ubuntu216.3-5ubuntu117.1-1ubuntu117.1-1ubuntu217.1-2ubuntu1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, aliases, references | OSV | |
| affected, aliases, references | CVE List, EUVD, GitHub Advisories, NVD, OSV | |
| severity | CVE List | |
| severity | EUVD, NVD | |
| aliases, references | GitHub Advisories | |
| aliases, published | EUVD | |
| first indexed | CVE List |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-123151 is a high vulnerability (CVSS 7.5) in Red Hat Enterprise Linux 10, published November 5, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.51%, the 43rd percentile. No source names a fixed version.