CVE-2026-54736

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (6th percentile of EPSS-scored CVEs). 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: epss, secondary
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
37
EG Risk 37/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 10, 2026

Last Modified

July 13, 2026

Advisory Details (5)

Auto-updated Jul 10, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
githubMentions a patch (unverified)

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-95g6-7jpj
github_release Patch Available

v5.14.1

Patch available: phalcon/cphalcon v5.14.1

https://github.com/phalcon/cphalcon/releases/tag/v5.14.1
github_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/17091
generic

[BUG]: Crypt::decrypt - hmac · Issue #17090 · phalcon/cphalcon · GitHub

https://github.com/phalcon/cphalcon/issues/17090
github_commit

commit ad53ab1b2e7e (phalcon/cphalcon)

Fix landed in phalcon/cphalcon commit ad53ab1b2e7e — awaiting tagged release

https://github.com/phalcon/cphalcon/commit/ad53ab1b2e7ec59b3af92b0b37b8aaa099011137

Vendor Advisories for CVE-2026-54736(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
phalcon/cphalcon5.10.0 ... v5.8.0 (94 versions)
  • every version up to 5.14.1: fixed in 5.14.1
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 32× 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.

Showing the most recent 100 of 123 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:12 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
  5. 2026-10-05 17:43 UTCEPSS rescore
  6. 2026-10-04 23:22 UTCEPSS rescore
  7. 2026-10-03 14:26 UTCEPSS rescore
  8. 2026-10-02 17:56 UTCEPSS rescore
  9. 2026-10-01 19:50 UTCEPSS rescore
  10. 2026-10-01 14:57 UTCEG score recompute
  11. 2026-09-30 15:03 UTCEPSS rescore
  12. 2026-09-29 15:22 UTCEPSS rescore
  13. 2026-09-28 13:51 UTCEPSS rescore
  14. 2026-09-28 09:45 UTCEG score recompute
  15. 2026-09-27 13:48 UTCEPSS rescore
  16. 2026-09-26 15:59 UTCEPSS rescore
  17. 2026-09-24 14:04 UTCEPSS rescore
  18. 2026-09-24 11:09 UTCEG score recompute
  19. 2026-09-23 17:54 UTCEPSS rescore
  20. 2026-09-23 05:43 UTCEG score recompute
  21. 2026-09-20 20:16 UTCEPSS rescore
  22. 2026-09-18 19:28 UTCEPSS rescore
  23. 2026-09-18 05:16 UTCEG score recompute
  24. 2026-09-17 19:31 UTCEPSS rescore
  25. 2026-09-16 14:08 UTCEPSS rescore
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  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 03:11 UTCEPSS rescore
  3. 2026-09-13 23:38 UTCEG score recompute
  4. 2026-09-13 16:47 UTCEPSS rescore
  5. 2026-09-13 08:10 UTCEG score recompute
  6. 2026-09-12 02:31 UTCEG score recompute
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-10 09:35 UTCEPSS rescore
  9. 2026-09-08 22:01 UTCEPSS rescore
  10. 2026-09-08 02:43 UTCEG score recompute
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:56 UTCEG score recompute
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-05 21:40 UTCEG score recompute
  15. 2026-09-04 05:06 UTCEPSS rescore
  16. 2026-09-02 14:12 UTCEPSS rescore
  17. 2026-09-01 13:54 UTCEPSS rescore
  18. 2026-09-01 04:40 UTCEPSS rescore
  19. 2026-08-30 19:17 UTCEPSS rescore
  20. 2026-08-30 06:04 UTCEG score recompute
  21. 2026-08-30 01:22 UTCEPSS rescore
  22. 2026-08-28 21:41 UTCEPSS rescore
  23. 2026-08-27 21:39 UTCEG score recompute
  24. 2026-08-27 14:25 UTCEPSS rescore
  25. 2026-08-27 00:43 UTCEG score recompute
  26. 2026-08-26 14:46 UTCEPSS rescore
  27. 2026-08-26 03:30 UTCEG score recompute
  28. 2026-08-25 13:49 UTCEPSS rescore
  29. 2026-08-24 20:13 UTCEG score recompute
  30. 2026-08-23 05:30 UTCEG score recompute
  31. 2026-08-23 00:19 UTCEPSS rescore
  32. 2026-08-22 03:48 UTCEG score recompute
  33. 2026-08-21 23:49 UTCEPSS rescore
  34. 2026-08-21 03:44 UTCEG score recompute
  35. 2026-08-20 22:55 UTCEPSS rescore
  36. 2026-08-20 01:31 UTCEG score recompute
  37. 2026-08-19 17:04 UTCEPSS rescore
  38. 2026-08-18 22:52 UTCEG score recompute
  39. 2026-08-18 13:48 UTCEPSS rescore
  40. 2026-08-17 22:10 UTCEG score recompute
  41. 2026-08-17 13:47 UTCEPSS rescore
  42. 2026-08-16 17:13 UTCEG score recompute
  43. 2026-08-16 14:56 UTCEPSS rescore
  44. 2026-08-16 05:11 UTCEG score recompute
  45. 2026-08-16 02:14 UTCEPSS rescore
  46. 2026-08-15 05:07 UTCEG score recompute
  47. 2026-08-15 01:30 UTCEPSS rescore
  48. 2026-08-14 05:02 UTCEG score recompute
  49. 2026-08-13 22:00 UTCEPSS rescore
  50. 2026-08-12 16:39 UTCEG score recompute
  51. 2026-08-12 13:51 UTCEPSS rescore
  52. 2026-08-11 16:19 UTCEG score recompute
  53. 2026-08-11 04:17 UTCEG score recompute
  54. 2026-08-11 00:00 UTCEPSS rescore
  55. 2026-08-09 15:58 UTCEG score recompute
  56. 2026-08-09 13:46 UTCEPSS rescore
  57. 2026-08-08 03:53 UTCEG score recompute
  58. 2026-08-06 15:47 UTCEG score recompute
  59. 2026-08-06 13:47 UTCEPSS rescore
  60. 2026-08-06 03:45 UTCEG score recompute
  61. 2026-08-05 19:17 UTCEPSS rescore
  62. 2026-08-05 01:35 UTCEG score recompute
  63. 2026-08-04 15:10 UTCEPSS rescore
  64. 2026-08-03 13:23 UTCEG score recompute
  65. 2026-08-03 10:36 UTCEPSS rescore
  66. 2026-08-02 13:06 UTCEG score recompute
  67. 2026-08-02 02:27 UTCEPSS rescore
  68. 2026-08-01 13:02 UTCEG score recompute
  69. 2026-08-01 04:16 UTCEPSS rescore
  70. 2026-07-31 00:52 UTCEG score recompute
  71. 2026-07-30 16:28 UTCEPSS rescore
  72. 2026-07-30 12:50 UTCEG score recompute
  73. 2026-07-30 01:30 UTCEPSS rescore
  74. 2026-07-28 00:30 UTCEG score recompute
  75. 2026-07-27 00:09 UTCEG score recompute

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Packagist:phalcon/cphalcon

Frequently asked(5)

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 on July 10, 2026, with the most recent update on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54736 actively exploited?
CVE-2026-54736 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54736?
CVE-2026-54736 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54736?
A fix for CVE-2026-54736 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54736 are linked in the Vendor Advisories panel on this page.

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