Arbitrary Argument Injection Affecting org.apache.sshd:sshd-core package, versions [2.0.0,2.19.0)[3.0.0-M1,3.0.0-M5)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-ORGAPACHESSHD-19352706
- published27 Aug 2026
- disclosed20 Jul 2026
- creditMitchell Benjamin
Introduced: 20 Jul 2026
CVE-2026-56624 (opens in a new tab)How to fix?
Upgrade org.apache.sshd:sshd-core to version 2.19.0, 3.0.0-M5 or higher.
Overview
Affected versions of this package are vulnerable to Arbitrary Argument Injection via the UserAuthPublicKey authentication path in sshd-core/src/main/java/org/apache/sshd/server/auth/pubkey/UserAuthPublicKey.java. An attacker can authenticate with a malicious OpenSSH user certificate by supplying unsupported critical options such as force-command or verify-required. The server-side certificate check accepted certificates that carried those options without rejecting them, so a user could log in and still execute commands other than the intended forced command. This breaks command restriction enforcement on SSH servers that rely on MINA SSHD user-certificate authentication, letting an authenticated user run unauthorized commands.