Is CVE-2026-54736 actively exploited?

No active exploitation of CVE-2026-54736 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-54736 be exploited remotely?

Yes. CVE-2026-54736 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-54736?

CVE-2026-54736 has a CVSS score of 8.2 (HIGH).

HOME VULNERABILITIESCVE-2026-54736

HIGH

CVE-2026-54736

CWE-208Published: July 10, 2026· Updated: Jul 13, 2026

8.2

CVSS v3.1

EPSS:0.15%probability of exploitation in 30 daysPercentile:4.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-54736 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges Req.None

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X