CVE-2026-54736
High
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.
SeverityHigh
CVSS8.2
Exploit probability—
ProductPhalcon/cphalcon
PublishedJul 10, 2026
First seenJul 10, 2026
Weakness typeCWE-208CWE-208CWE-347CWE-347
How to fix
Update
- phalcon/cphalcon5.14.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| phalcon/cphalconPackagist | v < 5.14.1 | 5.14.1 |
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