CVE-2026-40194phpseclib is a PHP secure communications library.
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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.
- CVSS
- 3.7 LOW (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-208
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
phpseclib phpseclib phpseclib:phpseclib | through 1.0.27; from 2.0.0 before 2.0.53; from 3.0.0 before 3.0.51 | NVD |
References
- https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194acpatch
- https://github.com/phpseclib/phpseclib/releases/tag/1.0.28release-notes
- https://github.com/phpseclib/phpseclib/releases/tag/2.0.53release-notes
- https://github.com/phpseclib/phpseclib/releases/tag/3.0.51release-notes
- https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qxvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.