CVE-2019-19726: OpenBSD

High severity, CVSS 7.8. EPSS: 3.5% chance of exploitation in the next 30 days.

OpenBSD through 6.6 allows local users to escalate to root because a check for LD_LIBRARY_PATH in setuid programs can be defeated by setting a very small RLIMIT_DATA resource limit. When executing chpass or passwd (which are setuid root), _dl_setup_env in ld.so tries to strip LD_LIBRARY_PATH from the environment, but fails when it cannot allocate memory. Thus, the attacker is able to execute their own library code as root.

Affected products

• OpenBSD OpenBSD: up to and including 6.6

Published 2019-12-12. Last modified 2026-06-17.