CVEvulnerability

CVE-2026-40194

3.7 LOW Published 2026-04-10 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2026-04-10
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
3.7 LOW — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-208

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.

Affected configurations

• phpseclib phpseclib (<= 1.0.27) • phpseclib phpseclib (>= 2.0.0 < 2.0.53) • phpseclib phpseclib (>= 3.0.0 < 3.0.51)

Related

Weakness · CWE (1)

  • CWE-208 Observable Timing Discrepancy weakness

References