Security Advisory

CVE-2026-40194

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-04-10 20:24:06

Last updated 2026-05-08 15:18:43

Assigner GitHub_M

State PUBLISHED

Description

phpseclib is a PHP secure communications library. Starting in 0.1.1 and prior to 3.0.51, 2.0.53, and 1.0.28, phpseclibNetSSH2::get_binary_packet() uses PHPs != operator to compare a received SSH packet HMAC against the locally computed HMAC. != on equal-length binary strings in PHP uses memcmp(), which short-circuits on the first differing byte. This is a real variable-time comparison (CWE-208), proven by scaling benchmarks. This vulnerability is fixed in 3.0.51, 2.0.53, and 1.0.28.

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