Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-54736— Phalcon: Non-constant-time HMAC verification in `Encryption\Crypt::decrypt` (timing side-channel)

Quick assessment

Affected
phalcon cphalcon
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Phalcon Phalcon是Phalcon公司开源的一个以 C 扩展形式交付的高性能、全栈 PHP 框架，能显著降低资源消耗。 Phalcon 5.14.1之前版本存在安全漏洞，该漏洞源于Phalcon\Encryption\Crypt::decrypt函数使用PHP/Zephir身份比较，导致可观察的时间差异，攻击者可以利用此漏洞逐个字节恢复有效标签，并将附加到选择的IV和密文，从而使decrypt()接受被篡改的加密内容。

AI Predicted 9.1 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
phalcon cphalcon < 5.14.1 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-54736

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Phalcon: Non-constant-time HMAC verification in `Encryption\Crypt::decrypt` (timing side-channel)
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Phalcon 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Phalcon Phalcon是Phalcon公司开源的一个以 C 扩展形式交付的高性能、全栈 PHP 框架，能显著降低资源消耗。 Phalcon 5.14.1之前版本存在安全漏洞，该漏洞源于Phalcon\Encryption\Crypt::decrypt函数使用PHP/Zephir身份比较，导致可观察的时间差异，攻击者可以利用此漏洞逐个字节恢复有效标签，并将附加到选择的IV和密文，从而使decrypt()接受被篡改的加密内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
phalcon cphalcon < 5.14.1 -

II. Public POCs for CVE-2026-54736

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-54736

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-54736 (2)

Vendor Advisories for CVE-2026-54736 (1)

Vendor Pages for CVE-2026-54736 (1)

Other References for CVE-2026-54736 (1)

IV. Related Vulnerabilities

Same product: cphalcon
Same vendor: phalcon
Same weakness: CWE-208

V. Comments for CVE-2026-54736

No comments yet

Leave a comment