CVE-2026-8711

CRITICALNVD 9.88.1▼
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-19. NVD baseline CVSS 9.8; sources differ by 1.7.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

NGINX JavaScript has a vulnerability when the js_fetch_proxy directive is configured with at least one client-controlled NGINX variable (for example, $http_*, $arg_*, $cookie_*) and a location invoking the ngx.fetch() operation from NGINX JavaScript. An unauthenticated attacker can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.

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

CVSS v3
9.8
EG Score
8.1(medium)
EPSS
55.1%
KEV
Not listed

Published

May 19, 2026

Last Modified

June 4, 2026

Advisory Details (1)

Auto-updated Jun 20, 2026
No patch confirmed yet.
generic

myF5

https://my.f5.com/manage/s/article/K000161307

Vendor Advisories for CVE-2026-8711(2)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunjs (0.9.4-1ubuntu0.1~esm1) @ resolute2026-06-29ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 76× 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 178 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-8711?
CVE-2026-8711 is a critical vulnerability published on May 19, 2026. NGINX JavaScript has a vulnerability when the jsfetchproxy directive is configured with at least one client-controlled NGINX variable (for example, $http*, $arg, $cookie_) and a location invoking the ngx.fetch() operation from NGINX JavaScript. An unauthenticated attacker can exploit this…
When was CVE-2026-8711 disclosed?
CVE-2026-8711 was first published in the National Vulnerability Database on May 19, 2026, with the most recent update on June 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8711 actively exploited?
CVE-2026-8711 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 55.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8711?
CVE-2026-8711 has a CVSS v3 base score of 9.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.1.
How do I remediate CVE-2026-8711?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8711, 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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