3.7

CVE-2026-40194

phpseclib has a variable-time HMAC comparison in SSH2::get_binary_packet() using != instead of hash_equals()

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Phpseclib ≫ Phpseclib Version <= 1.0.27
Phpseclib ≫ Phpseclib Version >= 2.0.0 < 2.0.53
Phpseclib ≫ Phpseclib Version >= 3.0.0 < 3.0.51
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.33% 0.25
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 3.7 2.2 1.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE-208 Observable Timing Discrepancy

Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.

https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx
Vendor Advisory
https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194ac
Patch
https://github.com/phpseclib/phpseclib/releases/tag/1.0.28
Release Notes
https://github.com/phpseclib/phpseclib/releases/tag/2.0.53
Release Notes
https://github.com/phpseclib/phpseclib/releases/tag/3.0.51
Release Notes