CVE-2026-42055

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-17. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4%CVSS: 8.1Exploit: None knownExposed: 0

A fix is available — apply it.

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules. This vulnerability exists when the proxy_http_version to 2 or grpc_pass directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers directive is set to off, and the large_client_header_buffers directive size is larger than 2 megabytes. A remote, unauthenticated attacker, along with conditions beyond their control, could send large headers while creating an upstream request. This may cause a heap-based 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
8.1
EG Score
8.1(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity81% × 45%
Exploitation4% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
4%
EPSS %ILE
90%
KEV
Not listed

Published

June 17, 2026

Last Modified

July 24, 2026

Advisory Details (1)

Auto-updated Jun 18, 2026
No patch confirmed yet.
generic

myF5

https://my.f5.com/manage/s/article/K000161584

Vendor Advisories for CVE-2026-42055(9)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhui5/rhua-rhel9:17847950762026-07-23redhat
ubuntunginx-light (1.28.3-2ubuntu1.6) @ resolute2026-07-16ubuntu
redhatnginx:1.24-8100020260707171317.489197e62026-07-13redhat
redhatnginx:1.24-9080020260707164406.92026-07-08redhat
redhatnginx:1.26-9080020260707110000.92026-07-08redhat
redhatnginx-2:1.20.1-28.el9_8.42026-07-07redhat
redhatnginx-2:1.26.3-6.el10_2.52026-07-07redhat
redhatnginx-main-1.30.3-2.hum12026-06-19redhat

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(3)

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 17× in last 7d / 118× 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 154 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-42055?
CVE-2026-42055 is a high vulnerability published on June 17, 2026. NGINX Plus and NGINX Open Source have a vulnerability in the ngxhttpproxyv2module and ngxhttpgrpcmodule modules. This vulnerability exists when the proxyhttpversion to 2 or grpcpass directives are used to proxy HTTP/2 traffic, the ignoreinvalidheaders directive is set to off, and the…
When was CVE-2026-42055 disclosed?
CVE-2026-42055 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42055 actively exploited?
CVE-2026-42055 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4% probability of exploitation in the next 30 days, which ranks it in the top 10.4% of all scored CVEs.
What is the CVSS score of CVE-2026-42055?
CVE-2026-42055 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-42055?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42055, 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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