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CVE-2026-40194: phpseclib has a variable-time HMAC comparison in SSH2::get_binary_packet() using != instead of hash_equals()

LOW CVSS 3.7 EPSS 0.01% Exploit Available 2 PoC

Published: April 10, 2026 | Last Modified: April 10, 2026

Description

phpseclib has a variable-time HMAC comparison in SSH2::get_binary_packet() using != instead of hash_equals()

Ghostwire Analysis — What This Means Practically

Exploitation Probability (EPSS): Low — 0.01% (1th percentile)

Low exploitation probability based on current threat landscape data. Standard patching timeline is appropriate.

This analysis is generated by Ghostwire from NVD, CISA KEV, EPSS, and open-source intelligence data. Verify findings through primary sources before acting.

Proof-of-Concept Exploits (2)

Security Coverage (1 articles)

CVE Feed
CVE-2026-40194 - phpseclib has a variable-time HMAC comparison in SSH2::get_binary_packet() using != instead of hash_equals()

References