CVE-2026-42934

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

Score 4.8 from GitHub Security Advisory published 2026-05-13. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
4.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 4.8Exploit: NoneExposed: 0

A fix is available — apply it.

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' control to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart.

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

CVSS v3
4.8
EG Score
4.8(medium)
EPSS
49.6%
KEV
Not listed

Published

May 13, 2026

Last Modified

June 18, 2026

Advisory Details (1)

Auto-updated Jun 17, 2026
No patch confirmed yet.
generic

myF5

https://my.f5.com/manage/s/article/K000161028

Vendor Advisories for CVE-2026-42934(1)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunginx-light (1.28.3-2ubuntu1.2) @ resolute2026-06-29ubuntu
ubuntunginx-naxsi-ui (1.4.6-1ubuntu3.9+esm6) @ trusty2026-06-29ubuntu

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

(2)

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 / 52× 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 136 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-42934?
CVE-2026-42934 is a medium vulnerability published on May 13, 2026. NGINX Plus and NGINX Open Source have a vulnerability in the ngxhttpcharsetmodule module. When charset, sourcecharset, and charsetmap and proxypass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers'…
When was CVE-2026-42934 disclosed?
CVE-2026-42934 was first published in the National Vulnerability Database on May 13, 2026, with the most recent update on June 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42934 actively exploited?
CVE-2026-42934 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 49.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42934?
CVE-2026-42934 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-42934?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42934, 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.

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