CVE-2026-54736

Summary

Phalcon is a high-performance, full-stack PHP framework. Prior to 5.14.1, Phalcon\Encryption\Crypt::decrypt compares the attacker-supplied HMAC tag against the freshly computed HMAC using PHP/Zephir identity comparison, which lowers to a byte-wise comparison that returns early on the first differing byte. This observable timing discrepancy can allow an attacker to recover a valid tag byte-by-byte and attach it to a chosen IV and ciphertext so that decrypt() accepts tampered encrypted content as authentic. This issue is fixed in version 5.14.1.

Affected Software

VendorProductVersion RangeStatus
phalconcphalcon< 5.14.1affected

Weaknesses

  • CWE-208: CWE-208: Observable Timing Discrepancy
  • CWE-347: CWE-347: Improper Verification of Cryptographic Signature

References