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Vulnerability record · CVE-2026-59846 · published 21 July 2026

CVE-2026-59846: Libssh os command injection vulnerability

Libssh · Libssh

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.

3.9 CVSS 3.1 Low EPSS 0.16% · top 95.4% CWE-78 · OS command injectionCWE-77 · Command injection
3.9CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
6References
1 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:42922 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:55855
https://access.redhat.com/errata/RHSA-2026:62217
https://access.redhat.com/errata/RHSA-2026:62218
https://access.redhat.com/security/cve/CVE-2026-59846 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2498179 Issue TrackingVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-59846), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.