PT-2026-32042 · Phpseclib · Phpseclib

Published 2026-04-10 · Updated 2026-04-10 · CVE-2026-40194

Mitre

CVSS v3.1

3.7

Low

AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

phpseclib is a PHP secure communications library. Prior to 3.0.51, 2.0.53, and 1.0.28, phpseclibNetSSH2::get binary packet() uses PHP's != 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.

Fix

Weakness Enumeration

CWE-208

Related Identifiers

CVE-2026-40194

Affected Products

Phpseclib

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-40194 · Security Note
• https://github.com/phpseclib/phpseclib/releases/tag/2.0.53 · Note
• https://github.com/phpseclib/phpseclib/releases/tag/1.0.28 · Note
• https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194ac · Note
• https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx · Note
• https://github.com/phpseclib/phpseclib/releases/tag/3.0.51 · Note