CVE-2026-45416

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 63% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — Patch released this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, SslClientHelloHandler.decode() reads the 24-bit TLS handshake length and, when the ClientHello does not fit in the first record, eagerly allocates ctx.alloc().buffer(handshakeLength) (line 161). The guard at line 140 is handshakeLength > maxClientHelloLength && maxClientHelloLength != 0, and the commonly-used SniHandler/AbstractSniHandler constructors (SniHandler(Mapping), SniHandler(AsyncMapping), AbstractSniHandler()) pass maxClientHelloLength=0 and handshakeTimeoutMillis=0, so the length guard is disabled and no timeout is scheduled. A 16 MiB request exceeds the default pooled chunk size and becomes a huge/unpooled allocation performed immediately. The buffer is retained in the handler until the channel closes. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
36.8%
KEV
Not listed

Published

June 8, 2026

Last Modified

July 6, 2026

Advisory Details (3)

Auto-updated Jun 12, 2026
Patch available. Sources: github_release, github.
github Patch Available

SNI handler pre-allocates up to 16 MiB from nine attacker bytes · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-x4gw-5cx5-pgmh
github_release Patch Available

netty-4.2.15.Final

Patch available: netty/netty netty-4.2.15.Final

https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
github_release Patch Available

netty-4.1.135.Final

Patch available: netty/netty netty-4.1.135.Final

https://github.com/netty/netty/releases/tag/netty-4.1.135.Final

Vendor Advisories for CVE-2026-45416(6)

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
redhatnetty-handler2026-07-02redhat
redhatoffline-knowledge-portal/rhokp-rhel9:17822393702026-06-23redhat

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

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
io.netty:netty-handler4.0.0.Alpha1 ... 4.1.99.Final (228 versions)4.1.135.Final—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 24× in last 7d / 105× 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 105 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-45416?
CVE-2026-45416 is a high vulnerability published on June 8, 2026. Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, SslClientHelloHandler.decode() reads the 24-bit TLS handshake length and, when the ClientHello does not fit in the first record, eagerly allocates…
When was CVE-2026-45416 disclosed?
CVE-2026-45416 was first published in the National Vulnerability Database on June 8, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45416 actively exploited?
CVE-2026-45416 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45416?
CVE-2026-45416 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-45416?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45416, 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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