Vulnerability in Ncopa Su-Exec
CVE-2026-82457
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (7.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/ncopa/su-exec/blob/89c016e6e08749d583efdeda04b9f73e1218e253/su-exec.c (technical-description)
- gist.github.com/thesmartshadow/ed96e2a88643c34a247c9b7cf9e311be (third-party-advisory)
- github.com/ncopa/su-exec (product)
- www.vulncheck.com/advisories/su-exec-through-0.3-privilege-escalation-via-numer… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82457?
- CVE-2026-82457 is a high-severity vulnerability in Ncopa Su-Exec, classified under Incorrect Conversion between Numeric Types. CVSS score: 7.8/10. Published 2026-08-29.
- How severe is CVE-2026-82457?
- High severity. CVSS v3 base score is 7.8 out of 10.