CVE-2026-62243

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-22. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

Netty (io.netty:netty-handler) versions from 4.2.0.Final through 4.2.16.Final and versions through 4.1.136.Final disable TLS hostname verification on the SslProvider.OPENSSL client path when a plain (non-extended) X509TrustManager is used and Unsafe-based trust-manager wrapping is unavailable (Java 25+). In this configuration the OpenSSL client does not perform hostname verification, allowing a man-in-the-middle attacker to present a certificate issued for a different hostname that is accepted without validation. Fixed in 4.2.17.Final and 4.1.137.Final.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

August 22, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Aug 22, 2026
Patch available. Sources: github.
generic

Netty 4.2.0 through 4.2.16 TLS Hostname Verification Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/netty-through-tls-hostname-verification-bypass
github Patch Available

Hostname verification disabled on the OpenSSL client path when trust-manager wrapping is unavailable (Java 25+) · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-p85m-gvr3-788c

Vendor Advisories for CVE-2026-62243(6)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhbk/keycloak-rhel9-operator2026-09-16redhat
redhatrhbk/keycloak-rhel9-operator:26.6-202026-09-16redhat
redhatrhbk/keycloak-rhel9-operator:26.4-262026-09-16redhat
redhatnetty-handler2026-09-10redhat

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
netty1:4.1.48-10 ... 1:4.1.48-9 (12 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
netty1:4.1.48-10 ... 1:4.1.48-16 (8 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
netty1:4.1.48-10 ... 1:4.1.48-16 (7 versions)——

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 38× in last 7d / 130× 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 130 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-62243?
CVE-2026-62243 is a high vulnerability published on August 22, 2026. Netty (io.netty:netty-handler) versions from 4.2.0.Final through 4.2.16.Final and versions through 4.1.136.Final disable TLS hostname verification on the SslProvider.OPENSSL client path when a plain (non-extended) X509TrustManager is used and Unsafe-based trust-manager wrapping is unavailable (Java…
When was CVE-2026-62243 disclosed?
CVE-2026-62243 was first published in the National Vulnerability Database on August 22, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-62243 actively exploited?
CVE-2026-62243 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 95.0% of all scored CVEs.
What is the CVSS score of CVE-2026-62243?
CVE-2026-62243 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-62243?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-62243, 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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