---
id: CVE-2026-54736
title: 'Phalcon is a high-performance, full-stack PHP framework'
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…
severity: none
cwe:
  - CWE-208
  - CWE-347
published: '2026-07-10'
updated: '2026-07-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54736'
references:
  - url: >-
      https://github.com/phalcon/cphalcon/commit/ad53ab1b2e7ec59b3af92b0b37b8aaa099011137
    label: security-advisories@github.com
  - url: 'https://github.com/phalcon/cphalcon/issues/17090'
    label: security-advisories@github.com
  - url: 'https://github.com/phalcon/cphalcon/pull/17091'
    label: security-advisories@github.com
  - url: 'https://github.com/phalcon/cphalcon/releases/tag/v5.14.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/phalcon/cphalcon/security/advisories/GHSA-8jqh-95g6-7jpj
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.0018
epssPercentile: 0.06788
ingestedAt: '2026-07-11T22:16:00.554Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.