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CVE-2026-59846

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

LOW
3.9
CVSS Score
Published: July 21, 2026 at 12:55 PM UTC
Updated: September 1, 2026 at 09:18 PM UTC
3 products affected across 2 vendorsEnterprise LinuxHardened ImagesLibssh

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Severity
LOW3.9
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Libssh· Libssh
95%
All versions
Enterprise Linux· Red Hatrpm
95%
10.08.09.0
Vendor states this is fixed in 0:0.10.4-19.el9_8 (unaffected)
Vendor states this is fixed in 0:0.12.0-3.el10_2 (unaffected)
Vendor states this is fixed in 0:0.9.6-17.el8_10 (unaffected)
Hardened Images· Red Hatcontainer
95%
1
Vendor states this is fixed in 0.12.1-4.hum1 (unaffected)

References (6)

VDB Entryx_refsource_REDHATVendor Advisory
Source: cverecord
https://access.redhat.com/security/cve/CVE-2026-59846
Issue Trackingx_refsource_REDHATVendor Advisory
Source: cverecord
https://bugzilla.redhat.com/show_bug.cgi?id=2498179
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:42922
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:55855
Vendor Advisoryx_refsource_REDHAT
Source: [email protected]
https://access.redhat.com/errata/RHSA-2026:62218
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:62217

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

3.9LOWredhat
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-77CWE-78

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