What’s Vulnerable › Vulnerabilities

CVE-2026-35535

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-03 · updated 2026-09-01
• Weakness: CWE-271

Description

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: before 1.9.17; 1.9.17, 1.9.17-p1, 1.9.17-p2 — fixed in 1.9.17

How to fix

Upgrade to a fixed version: Siemens Sinec Os 4.0; sudo 1.9.17. Check the vendor advisory for mitigations.

References

• https://bugs.debian.org/1130593
• https://bugs.launchpad.net/ubuntu/+source/sudo/+bug/2143042
• https://github.com/sudo-project/sudo/commit/3e474c2f201484be83d994ae10a4e20e8c81bb69
• https://www.qualys.com/2026/03/10/crack-armor.txt
• https://lists.debian.org/debian-lts-announce/2026/06/msg00003.html
• https://access.redhat.com/errata/RHSA-2026:10758
• https://access.redhat.com/errata/RHSA-2026:11521
• https://access.redhat.com/errata/RHSA-2026:12310
• https://access.redhat.com/errata/RHSA-2026:13731
• https://access.redhat.com/errata/RHSA-2026:13888
• https://access.redhat.com/errata/RHSA-2026:13889
• https://access.redhat.com/errata/RHSA-2026:13891

Get alerted when CVE-2026-35535 or the next vulnerability affects your stack