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CVE-2026-40194

3.7 · LOW

phpseclib is a PHP secure communications library.

Published Apr 10, 2026CWE-208EPSS 0.37%

Overview

CVE-2026-40194 is a low-severity vulnerability. It was published on April 10, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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, phpseclib\Net\SSH2::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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194acGitHubgithub.com/phpseclib/phpseclib/releases/tag/1.0.28GitHubgithub.com/phpseclib/phpseclib/releases/tag/2.0.53GitHubgithub.com/phpseclib/phpseclib/releases/tag/3.0.51GitHubgithub.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qxGitHubgithub.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx

How CyberStrike helps

Frequently asked questions

What is CVE-2026-40194?

CVE-2026-40194 is a low-severity vulnerability. It was published on April 10, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2026-40194?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-40194?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-40194?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-40194 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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