Quick answers
- Is CVE-2026-123151 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123151 being exploited in the wild.
- How severe is CVE-2026-123151?
- Informational severity, published 5 November 2026.
- Which products and versions are affected?
- GNU GDB.
- Is there a fix for CVE-2026-123151?
- No fixed version is recorded yet. Only connect GDB to trusted debug targets. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-123151 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-123151?
- Check whether you run Gnu GDB. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
Only connect GDB to trusted debug targets.
Technical details
A stack buffer overflow exists in GDB's parsing of remote target replies, specifically in parse_tsv_definition when handling tracing support messages. The vulnerability is triggered automatically during the remote connection handshake before user interaction, requiring only that the attacker control the remote debug target. Successful exploitation can lead to denial of service or arbitrary code execution in the GDB client process with user privileges.
Affected products
- GNU GDB
Timeline
- 2026-11-05: disclosed