Information Exposure Affecting php-phpseclib3 package, versions <3.0.19-1+deb12u5
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-ECHOLATEST-PHPPHPSECLIB3-19512334
- published3 Sept 2026
- disclosed10 Apr 2026
Introduced: 10 Apr 2026
CVE-2026-40194 (opens in a new tab)How to fix?
Upgrade Echo:latest php-phpseclib3 to version 3.0.19-1+deb12u5 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream php-phpseclib3 package and not the php-phpseclib3 package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.
References
- https://advisory.echohq.com/cve/CVE-2026-40194
- https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194ac
- https://github.com/phpseclib/phpseclib/releases/tag/1.0.28
- https://github.com/phpseclib/phpseclib/releases/tag/2.0.53
- https://github.com/phpseclib/phpseclib/releases/tag/3.0.51
- https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx