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.
CVE-2026-54736
HIGHPre-NVD 8.28.2
EchelonGraph scoreLOW confidence
This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: secondary
8.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 8.2Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.2
- EG Score
- 8.2(low)
- EPSS
- —
- KEV
- Not listed
Published
July 10, 2026
Last Modified
July 10, 2026
Advisory Details (5)
Auto-updated Jul 10, 2026Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available
Non-constant-time HMAC verification in `Encryption\Crypt::decrypt` (timing side-channel) · Advisory · phalcon/cphalcon · GitHub
https://github.com/phalcon/cphalcon/security/advisories/GHSA-8jqh-95g6-7jpjgithub_release Patch Available
v5.14.1
Patch available: phalcon/cphalcon v5.14.1
https://github.com/phalcon/cphalcon/releases/tag/v5.14.1github_pr
CP-17090 crypt decrypt hmac
Fix merged in phalcon/cphalcon PR #17091 on 2026-06-08 — awaiting tagged release
https://github.com/phalcon/cphalcon/pull/17091generic
[BUG]: Crypt::decrypt - hmac · Issue #17090 · phalcon/cphalcon · GitHub
https://github.com/phalcon/cphalcon/issues/17090github_commit
commit ad53ab1b2e7e (phalcon/cphalcon)
Fix landed in phalcon/cphalcon commit ad53ab1b2e7e — awaiting tagged release
https://github.com/phalcon/cphalcon/commit/ad53ab1b2e7ec59b3af92b0b37b8aaa099011137Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 4× in last 7d / 4× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-11 21:37 UTCEG score recompute
- 2026-07-11 09:35 UTCEG score recompute
- 2026-07-10 21:33 UTCEG score recompute
- 2026-07-10 21:32 UTCMITRE cvelistV5first tracked
Frequently asked(4)
What is CVE-2026-54736?
CVE-2026-54736 is a high vulnerability published on July 10, 2026. 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…
When was CVE-2026-54736 disclosed?
CVE-2026-54736 was first published in the National Vulnerability Database on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-54736?
CVE-2026-54736 has a CVSS v3 base score of 8.2 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-54736?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54736, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-54736
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