CVE-2026-82457Public exploit

Local root execution via numeric identifier truncation

Published Aug 29, 2026 · Updated Aug 29, 2026

Incorrect numeric conversion in su-exec 0.3 and earlier allows local users to execute target programs as root via oversized identifiers. In su-exec.c, strtol accepts an out-of-range UID or GID, and assignment to uid_t or gid_t truncates the value to zero before setuid, setgid, and execvp. Reachability requires control of identity configuration passed to a root-run su-exec process; the demonstrated consequence is root execution inside the container, not host escape.

CVSS severity8.5
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect numeric conversion in su-exec 0.3 and earlier allows local users to execute target programs as root via oversized identifiers. In su-exec.c, strtol accepts an out-of-range UID or GID, and assignment to uid_t or gid_t truncates the value to zero before setuid, setgid, and execvp. Reachability requires control of identity configuration passed to a root-run su-exec process; the demonstrated consequence is root execution inside the container, not host escape.

The record

CVE
CVE-2026-82457
Published
Aug 29, 2026
Updated
Aug 29, 2026
Vendor
Natanael Copa
Product
su-exec
Classifications
CWE-681, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Natanael Copa · su-execversion=0 <=0.3

Published CVSS scores

8.5VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-681Incorrect Conversion between Numeric Types
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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