Libssh: libssh: information disclosure via proxycommand %r username expansion
8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 3.9epss 0.2%
exploitation probability
0.2%top 95% of all CVEs
observed exploitation
nono source reports it
A flaw was found in libssh. A malicious username expanded through %r in ProxyCommand handling can inject shell metacharacters, exposing environment variables and causing unintended shell behavior.
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Affected products
Red Hat · Red Hat Enterprise Linux 10Red Hat · Red Hat Enterprise Linux 8Red Hat · Red Hat Enterprise Linux 9Red Hat · Red Hat Hardened ImagesReferences
https://access.redhat.com/errata/RHSA-2026:42922https://access.redhat.com/errata/RHSA-2026:55855https://access.redhat.com/errata/RHSA-2026:62217https://access.redhat.com/errata/RHSA-2026:62218https://access.redhat.com/security/cve/CVE-2026-59846https://bugzilla.redhat.com/show_bug.cgi?id=2498179