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Sudo Privilege Drop Failure in setuid/setgid Not Treated as Fatal Error, Enabling Privilege Escalation During Mailer Execution

Last refreshed2026-10-07

Status: UPDATED  |  Advisory ID: CVE-2026-35535

Key Details

CVECVE-2026-35535
CVSS Score / Version7.4 (High) / CVSS v3.1
Updated2026-09-01
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Proseattack vector is local; attack complexity is high; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected productsSudo project sudo, Siemens sinec_os, and Siemens RUGGEDCOM RST2428P
Classified asCWE-271 (Privilege Dropping / Lowering Errors)
Exploitation prediction (EPSS)0.18% probability of exploitation in the next 30 days (7% percentile) -- FIRST.org's EPSS model.

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
Sudo projectsudo
Siemenssinec_os
SiemensRUGGEDCOM RST2428P
SubsystemsGeneral OT
SectorsMultiple

What to Know

In Sudo through 1.9.17p2 before 3e474c2, a failure of a setuid, setgid, or setgroups call, during a privilege drop before running the mailer, is not a fatal error and can lead to privilege escalation.

What to Do

Monitor Sudo project's and Siemens's web pages for any future patch releases.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-35535
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-35535