CVE-2026-59846

LOW 3.9

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

CVSS Score

3.9

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	red hat
Product	red hat enterprise linux 10
Published	Jul 21, 2026

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CVSS v3 Breakdown

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

Red Hat / Red Hat Enterprise Linux 10

All versions affected

Red Hat / Red Hat Enterprise Linux 8

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat Hardened Images

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-59846 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2498179

Credits

Red Hat would like to thank Mikhail Ilin and Saransh Rana for reporting this issue.