CVE-2026-82457 su-exec through 0.3 Privilege Escalation via Numeric User ID
Attackers can escalate privileges to root by supplying large numeric user IDs that truncate to zero in su-exec.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-82457?
CVE-2026-82457 is a high-severity vulnerability in ncopa su-exec, published on 29 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
su-exec through 0.3 fails to validate numeric user and group identifiers parsed with strtol before assigning to uid_t and gid_t, allowing truncation of out-of-range values to zero. Attackers can supply large numeric identifiers that truncate to root's identifier, causing su-exec to execute target programs with root privileges instead of intended unprivileged accounts.
Weakness: CWE-681
Which versions are affected by CVE-2026-82457?
How do I fix CVE-2026-82457?
No fix has been published for CVE-2026-82457 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-82457 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82457 exists.
Sources
Also known as GHSA-qpg9-jg2w-m84x.