CVE-2026-59846

Low

Open

TLP:CLEAR

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

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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.

Details

CVSS Score: 3.9
EPSS Score ⓘ: 0.11%

1.8th percentile
CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Confidence: 90%
Published: Jul 21, 2026
Last Modified: Aug 12, 2026

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