Libssh: invalid return code for chacha20 poly1305 with openssl backend

Summary

A flaw was found in libssh when using the ChaCha20 cipher with the OpenSSL library. If an attacker manages to exhaust the heap space, this error is not detected and may lead to libssh using a partially initialized cipher context. This occurs because the OpenSSL error code returned aliases with the SSH_OK code, resulting in libssh not properly detecting the error returned by the OpenSSL library. This issue can lead to undefined behavior, including compromised data confidentiality and integrity or crashes.

Timeline

1. Jul 7, 2025, 2:24 PM UTCCVE published
2. Jan 22, 2026, 4:55 AM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 16, 2026, 10:06 AM UTCRecord last updated

Affected versions

• libssh

  From 0.10.0 · fixed in 0.11.2

• libssh

  Version range not reported

• libssh

  Version range not reported

• libssh

  Version range not reported

• libssh

  Version range not reported

• libssh

  Version range not reported

• libssh

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• libssh2

  Version range not reported

• libssh2

  Version range not reported

• libssh

  Version range not reported

• openshift/ose-rhel-coreos-8

  Version range not reported

References 17