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 — 4 sources updated 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

August 11, 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(10)

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

Patch Availability(9)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunginx-light (1.28.3-2ubuntu1.6) @ resolute2026-08-20ubuntu
redhatdiscovery/discovery-ui-rhel9:17848217502026-07-27redhat
redhatrhui5/rhua-rhel9:17847950762026-07-23redhat
redhatnginx:1.24-8100020260707171317.489197e62026-07-13redhat
redhatnginx:1.24-9080020260707164406.92026-07-08redhat
redhatnginx:1.26-9080020260707110000.92026-07-08redhat
redhatnginx-2:1.26.3-6.el10_2.52026-07-07redhat
redhatnginx-2:1.20.1-28.el9_8.42026-07-07redhat
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.

Affected Packages

(8 across 8 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
nginx—1.26.3-r2—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
nginx—1.28.3-r4—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
nginx—1.28.3-r4—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
nginx—1.30.3-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
nginx1.18.0-6.1 ... 1.18.0-6.1+deb11u7 (8 versions)1.18.0-6.1+deb11u8—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
nginx1.22.1-9 ... 1.22.1-9+deb12u8 (9 versions)1.22.1-9+deb12u9—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nginx1.26.3-3 ... 1.26.3-3+deb13u6 (7 versions)1.26.3-3+deb13u7—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nginx1.26.3-3 ... 1.30.1-4 (24 versions)1.30.1-5—

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 30× in last 7d / 151× 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 290 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 August 11, 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 10.2% 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-42055

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