CVE-2026-59899

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 74% 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, nvd
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 is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, HttpContentEncoder (the superclass of the production handler HttpContentCompressor) maintains a per-channel ArrayDeque named acceptEncodingQueue that accumulates attacker-controlled data without any size limit. The queue is filled on the I/O thread for every inbound HTTP request and drained only when the application later writes a non-1xx response. This creates a resource exhaustion vulnerability when an attacker exploits HTTP/1.1 pipelining to flood the connection with requests faster than the application produces responses. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.

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%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

July 22, 2026

Last Modified

August 6, 2026

Advisory Details (3)

Auto-updated Jul 29, 2026
Patch available. Sources: github, github_release.
github_release Patch Available

netty-4.2.16.Final

Patch available: netty/netty netty-4.2.16.Final

https://github.com/netty/netty/releases/tag/netty-4.2.16.Final
github_release Patch Available

netty-4.1.136.Final

Patch available: netty/netty netty-4.1.136.Final

https://github.com/netty/netty/releases/tag/netty-4.1.136.Final
github Patch Available

[HttpContentEncoder] Unbounded Per-Connection Queue Growth via HTTP/1.1 Pipelining Leads to Denial of Service · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-q4f6-jm68-57ww

Vendor Advisories for CVE-2026-59899(10)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatnetty-codec-http2026-09-10redhat
redhatrhoai/odh-trustyai-service-rhel9:17881986812026-09-08redhat
redhatdevspaces/pluginregistry-rhel9:17877597232026-09-01redhat

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-codec-http4.0.0.Alpha1 ... 4.1.99.Final (229 versions)4.1.136.Final—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 91× 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 149 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-59899?
CVE-2026-59899 is a high vulnerability published on July 22, 2026. Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, HttpContentEncoder (the superclass of the production handler HttpContentCompressor) maintains a per-channel ArrayDeque<CharSequence> named acceptEncodingQueue that accumulates…
When was CVE-2026-59899 disclosed?
CVE-2026-59899 was first published in the National Vulnerability Database on July 22, 2026, with the most recent update on August 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59899 actively exploited?
CVE-2026-59899 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 73.6% of all scored CVEs.
What is the CVSS score of CVE-2026-59899?
CVE-2026-59899 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-59899?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59899, 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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