CVE-2026-59847

Summary

A flaw was found in libssh. Incorrect AES-GCM finalization checks in builds using the OpenSSL backend can effectively remove integrity protection, allowing an in-path attacker to modify plaintext on the wire without detection.

Affected Software

Weaknesses

Workarounds

Disable the aes128-gcm@openssh.com and aes256-gcm@openssh.com ciphers.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://access.redhat.com/security/cve/CVE-2026-59847
• https://bugzilla.redhat.com/show_bug.cgi?id=2498180

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