Vulnerability · Published Aug 29, 2026 · Assigned by VulnCheck
CVE-2026-82457su-exec through 0.3 Privilege Escalation via Numeric User ID
High 7.8
In plain English
A high-severity security flaw in su-exec from ncopa. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 92.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
Weakness: CWE-681 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- Vulnerable code: su-exec.c (strtol into uid_t without range check) technical-description
- Reporter's write-up third-party-advisory
- https://github.com/ncopa/su-exec product
- VulnCheck Advisory: su-exec through 0.3 Privilege Escalation via Numeric User ID third-party-advisory