CVE-2026-59846

LOW

Libssh: libssh: information disclosure via proxycommand %r username expansion

Title source: cna
STIX 2.1

Description

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.

References (3)

Core 3
Core References
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:42922
https://access.redhat.com/errata/RHSA-2026:42922
Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-59846
Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat
RHBZ#2498179
https://bugzilla.redhat.com/show_bug.cgi?id=2498179

Scores

CVSS v3 3.9
EPSS 0.0012
EPSS Percentile 2.2%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-77
Status published
Products (10)
libssh/libssh
Red Hat/Red Hat Enterprise Linux 10
Red Hat/Red Hat Enterprise Linux 8
Red Hat/Red Hat Enterprise Linux 9
Red Hat/Red Hat Hardened Images
Red Hat/Red Hat Hardened Images 0.12.1-4.hum1
redhat/enterprise_linux 8.0
redhat/enterprise_linux 9.0
redhat/enterprise_linux 10.0
redhat/hardened_images
Published Jul 21, 2026
Tracked Since Jul 21, 2026