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: 0.9%, top 44% 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 — 3 sources updated 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: 1%CVSS: 7.5Exploit: None knownExposed: 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)
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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

June 8, 2026

Last Modified

August 20, 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(15)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatnetty-handler2026-08-12redhat
redhateap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el7eap2026-08-11redhat
redhatio.netty/netty-handler:4.1.132.Final-redhat-000012026-08-03redhat
redhateap8-wildfly-0:8.1.7.1-1.GA_redhat_00004.1.el9eap2026-08-03redhat
redhatcryostat/jfr-datasource-rhel9:4.2.0-132026-07-29redhat
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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
netty1:4.1.48-10 ... 1:4.1.48-9 (16 versions)——
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)——
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 30× in last 7d / 125× 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 210 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 August 20, 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 1% probability of exploitation in the next 30 days, which ranks it in the top 44.4% of all scored CVEs.
What is the CVSS score of CVE-2026-45416?
CVE-2026-45416 has a CVSS v3 base score of 7.5 (NVD).
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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-45416

Explore →

Is Your Infrastructure Affected by CVE-2026-45416?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs