GHSA-8jqh-95g6-7jpj: phalcon/cphalcon (CVE-2026-54736)

Package	Ecosystem	Affected	Fixed in
phalcon/cphalcon	Packagist	<5.14.1	5.14.1

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Phalcon's `Crypt::decrypt` in the Packagist package phalcon/cphalcon, versions before 5.14.1, checks the HMAC tag with a comparison whose timing depends on how many leading bytes match, creating a timing side-channel. An attacker who can submit ciphertexts and measure response times could potentially forge a valid tag and defeat the integrity check, though the source notes there is no confidentiality break on its own. Upgrade to 5.14.1, which fixes the issue.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.2	High	4.0	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	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0018, the 7th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:07 UTC First seen by agentprime
31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.