Improper Verification of Cryptographic Signature Affecting libssh package, versions [,0.11.5)[0.12.0,0.12.1)
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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- published25 Jul 2026
- disclosed21 Jul 2026
- creditUnknown
Introduced: 21 Jul 2026
CVE-2026-59847 (opens in a new tab)How to fix?
Upgrade libssh to version 0.11.5, 0.12.1 or higher.
Overview
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature due to incorrect AES-GCM finalization checks in builds using the OpenSSL backend. An attacker can alter transmitted plaintext data without detection by exploiting the lack of proper integrity verification in the aes128-gcm@openssh.com and aes256-gcm@openssh.com ciphers.
Workaround
This vulnerability can be mitigated by disabling the aes128-gcm@openssh.com and aes256-gcm@openssh.com ciphers.