CVE-2026-82457 (CVSS 7.8)

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0012

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-681 CWE-681

References

Other References

https://gist.github.com/thesmartshadow/ed96e2a88643c34a247c9b7cf9e311be https://github.com/ncopa/su-exec https://github.com/ncopa/su-exec/blob/89c016e6e08749d583efdeda04b9f73e1218e253/su-exec.c https://www.vulncheck.com/advisories/su-exec-through-0.3-privilege-escalation-via-numeric-user-id https://gist.github.com/thesmartshadow/ed96e2a88643c34a247c9b7cf9e311be

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-82457? +

CVE-2026-82457 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0012, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-82457? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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