CVE-2026-18329

HIGHPre-NVD 8.28.2—
EchelonGraph scoreHIGH confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-09-02. a secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
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%CVSS: 8.2Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Description

NGINX JavaScript (njs) and QuickJS (qjs) engines have a vulnerability when a js_access handler performs asynchronous request body processing and an exception is thrown during asynchronous access-control evaluation before an explicit access denial is returned. An unauthenticated attacker can exploit this vulnerability by sending a crafted HTTP request that triggers an error condition in the access validation logic. This may cause the js_access phase to fail open, allowing the request to proceed instead of being denied, resulting in an authentication or authorization bypass and unauthorized access to protected resources.

Impact

This vulnerability may allow remote attackers to bypass js_access controls. There is no control plane exposure; this is a data plane issue only.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS v3
8.2
EG Score
8.2(high)
EG Risk
52(Track)
EG Risk 52/100SSVC: Track

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%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Sep 2, 2026
No patch confirmed yet.
generic

myF5

https://my.f5.com/manage/s/article/K000162599

Vendor Advisories for CVE-2026-18329(2)

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)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libnginx-mod-js0.8.9-1 ... 1.0.1-1 (12 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 41× in last 7d / 87× 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.

  1. 2026-09-19 01:07 UTCEG score recompute
  2. 2026-09-19 01:07 UTCVendor advisory
  3. 2026-09-19 01:06 UTCGHSA enrichment
  4. 2026-09-18 19:27 UTCEPSS rescore
  5. 2026-09-18 13:42 UTCVendor advisory
  6. 2026-09-18 13:42 UTCGHSA enrichment
  7. 2026-09-18 02:15 UTCEG score recompute
  8. 2026-09-18 02:15 UTCVendor advisory
  9. 2026-09-18 02:15 UTCGHSA enrichment
  10. 2026-09-17 14:51 UTCVendor advisory
  11. 2026-09-17 14:51 UTCGHSA enrichment
  12. 2026-09-17 03:27 UTCVendor advisory
  13. 2026-09-17 03:27 UTCGHSA enrichment
  14. 2026-09-16 16:02 UTCEG score recompute
  15. 2026-09-16 16:02 UTCVendor advisory
  16. 2026-09-16 16:02 UTCGHSA enrichment
  17. 2026-09-16 14:07 UTCEPSS rescore
  18. 2026-09-16 05:14 UTCEPSS rescore
  19. 2026-09-16 04:38 UTCVendor advisory
  20. 2026-09-16 04:38 UTCGHSA enrichment
  21. 2026-09-15 17:13 UTCVendor advisory
  22. 2026-09-15 17:13 UTCGHSA enrichment
  23. 2026-09-15 05:49 UTCEG score recompute
  24. 2026-09-15 05:49 UTCVendor advisory
  25. 2026-09-15 05:48 UTCGHSA enrichment
Show 62 more
  1. 2026-09-14 18:24 UTCVendor advisory
  2. 2026-09-14 18:24 UTCGHSA enrichment
  3. 2026-09-14 06:43 UTCVendor advisory
  4. 2026-09-14 06:43 UTCGHSA enrichment
  5. 2026-09-13 19:18 UTCEG score recompute
  6. 2026-09-13 19:18 UTCVendor advisory
  7. 2026-09-13 19:18 UTCGHSA enrichment
  8. 2026-09-13 16:46 UTCEPSS rescore
  9. 2026-09-13 07:53 UTCVendor advisory
  10. 2026-09-13 07:53 UTCGHSA enrichment
  11. 2026-09-12 20:29 UTCEG score recompute
  12. 2026-09-12 20:29 UTCVendor advisory
  13. 2026-09-12 20:29 UTCGHSA enrichment
  14. 2026-09-12 15:00 UTCEPSS rescore
  15. 2026-09-12 09:05 UTCVendor advisory
  16. 2026-09-12 09:05 UTCGHSA enrichment
  17. 2026-09-11 21:40 UTCEG score recompute
  18. 2026-09-11 21:40 UTCVendor advisory
  19. 2026-09-11 21:40 UTCGHSA enrichment
  20. 2026-09-11 14:52 UTCEPSS rescore
  21. 2026-09-11 10:16 UTCEG score recompute
  22. 2026-09-11 10:15 UTCGHSA enrichment
  23. 2026-09-11 09:36 UTCEPSS rescore
  24. 2026-09-10 22:50 UTCGHSA enrichment
  25. 2026-09-10 11:26 UTCEG score recompute
  26. 2026-09-10 11:26 UTCGHSA enrichment
  27. 2026-09-10 09:34 UTCEPSS rescore
  28. 2026-09-09 23:31 UTCGHSA enrichment
  29. 2026-09-09 10:36 UTCVendor advisory
  30. 2026-09-09 10:36 UTCGHSA enrichment
  31. 2026-09-08 23:12 UTCEG score recompute
  32. 2026-09-08 23:12 UTCVendor advisory
  33. 2026-09-08 23:12 UTCGHSA enrichment
  34. 2026-09-08 22:00 UTCEPSS rescore
  35. 2026-09-08 11:09 UTCVendor advisory
  36. 2026-09-08 11:08 UTCGHSA enrichment
  37. 2026-09-07 23:42 UTCEG score recompute
  38. 2026-09-07 23:42 UTCVendor advisory
  39. 2026-09-07 23:42 UTCGHSA enrichment
  40. 2026-09-07 16:01 UTCEPSS rescore
  41. 2026-09-07 12:18 UTCVendor advisory
  42. 2026-09-07 12:17 UTCGHSA enrichment
  43. 2026-09-07 00:51 UTCEG score recompute
  44. 2026-09-07 00:50 UTCGHSA enrichment
  45. 2026-09-06 13:47 UTCEPSS rescore
  46. 2026-09-06 13:24 UTCGHSA enrichment
  47. 2026-09-06 01:59 UTCEG score recompute
  48. 2026-09-06 01:59 UTCGHSA enrichment
  49. 2026-09-05 14:35 UTCGHSA enrichment
  50. 2026-09-05 03:11 UTCGHSA enrichment
  51. 2026-09-04 15:46 UTCEG score recompute
  52. 2026-09-04 15:46 UTCGHSA enrichment
  53. 2026-09-04 05:06 UTCEPSS rescore
  54. 2026-09-04 04:20 UTCGHSA enrichment
  55. 2026-09-03 16:55 UTCGHSA enrichment
  56. 2026-09-03 06:04 UTCGHSA enrichment
  57. 2026-09-02 18:36 UTCEG score recompute
  58. 2026-09-02 18:36 UTCGHSA enrichment
  59. 2026-09-02 18:06 UTCEG score recompute
  60. 2026-09-02 16:37 UTCEG score recompute
  61. 2026-09-02 15:49 UTCEG score recompute
  62. 2026-09-02 15:46 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18329?
CVE-2026-18329 is a high vulnerability published on September 2, 2026. Description NGINX JavaScript (njs) and QuickJS (qjs) engines have a vulnerability when a jsaccess handler performs asynchronous request body processing and an exception is thrown during asynchronous access-control evaluation before an explicit access denial is returned. An unauthenticated attacker…
When was CVE-2026-18329 disclosed?
CVE-2026-18329 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18329 actively exploited?
CVE-2026-18329 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 68.5% of all scored CVEs.
What is the CVSS score of CVE-2026-18329?
CVE-2026-18329 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-18329?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18329, 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

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