Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/phalcon/cphalcon/commit/ad53ab1b2e7ec59b3af92b0b37b8aaa099011
- https://github.com/phalcon/cphalcon/issues/17090
- https://github.com/phalcon/cphalcon/pull/17091
- https://github.com/phalcon/cphalcon/releases/tag/v5.14.1
- https://github.com/phalcon/cphalcon/security/advisories/GHSA-8jqh-95g6-7jpj
FAQ
What is CVE-2026-54736?
CVE-2026-54736 is a documented vulnerability. 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 i...
How severe is CVE-2026-54736?
CVSS scoring is not yet available for CVE-2026-54736. Check NVD for updates.
Is there a patch for CVE-2026-54736?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.