CVE-2026-54736

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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/phalcon/cphalcon/commit/ad53ab1b2e7ec59b3af92b0b37b8aaa099011137
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

Configurations

No configuration.

History

25 Oct 2026, 15:10

Type	Values Removed	Values Added
Summary		(es) Phalcon es un framework PHP de alto rendimiento y pila completa. Antes de la versión 5.14.1, Phalcon\Encryption\Crypt::decrypt compara la etiqueta HMAC proporcionada por el atacante con el HMAC recién calculado utilizando la comparación de identidad de PHP/Zephir, que se reduce a una comparación byte a byte que retorna anticipadamente al primer byte diferente. Esta discrepancia de tiempo observable puede permitir a un atacante recuperar una etiqueta válida byte a byte y adjuntarla a un IV y texto cifrado elegidos para que decrypt() acepte contenido cifrado manipulado como auténtico. Este problema está solucionado en la versión 5.14.1.

Information

Published : 2026-07-10 22:16

Updated : 2026-10-25 15:10

NVD link : CVE-2026-54736

Mitre link : CVE-2026-54736

CVE.ORG link : CVE-2026-54736

JSON object : View

Products Affected

No product.

CWE

CWE-208

Observable Timing Discrepancy

CWE-347

Improper Verification of Cryptographic Signature

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