Vulnerability in Phpseclib
CVE-2026-40194
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, phpseclib\Net\SSH2::get_binary_packet() uses PHP's != operator to compare a received SSH packet HMAC against the locally computed…
EPSS: 0.000 (2.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Phpseclib — versions >= 3.0.0, < 3.0.51, >= 2.0.0, < 2.0.53, >= 0.1.1, < 1.0.28
Weakness classification (CWE)
References
- https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx (x_refsource_CONFIRM, Vendor Advisory)
- https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194ac (Patch, x_refsource_MISC)
- https://github.com/phpseclib/phpseclib/releases/tag/1.0.28 (x_refsource_MISC, Release Notes)
- https://github.com/phpseclib/phpseclib/releases/tag/2.0.53 (x_refsource_MISC, Release Notes)
- https://github.com/phpseclib/phpseclib/releases/tag/3.0.51 (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-40194?
- CVE-2026-40194 is a low-severity vulnerability in Phpseclib, classified under CWE-208. CVSS score: 3.7/10. Published 2026-04-10.
- How severe is CVE-2026-40194?
- Low severity. CVSS v3 base score is 3.7 out of 10.