CVE-2026-35535: Siemens Sinec OS

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Siemens Sinec OS: before 4.0 (fixed in 4.0)
• Sudo Project Sudo: before 1.9.17 (fixed in 1.9.17); version 1.9.17 only

Published 2026-04-03. Last modified 2026-09-01.