CVE-2026-59902

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: 0.4% (28th percentile of EPSS-scored CVEs). 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: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.sctp.SctpMessageCompletionHandler limits incomplete messages and fragment counts but not maxBufferedBytes, allowing unauthenticated peers to exhaust memory with large SCTP fragments. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 17, 2026

Last Modified

September 23, 2026

Advisory Details (6)

Auto-updated Aug 17, 2026
Patch available. Sources: github_release, github, github_commit, github_pr.
github Patch Available

Memory Exhaustion in SctpMessageCompletionHandler · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-2qj4-mmr9-4v2f
github_release Patch Available

netty-4.2.17.Final

Patch available: netty/netty netty-4.2.17.Final

https://github.com/netty/netty/releases/tag/netty-4.2.17.Final
github_release Patch Available

netty-4.1.137.Final

Patch available: netty/netty netty-4.1.137.Final

https://github.com/netty/netty/releases/tag/netty-4.1.137.Final
github_pr Patch Available

Merge changes from forks (#17213)

Patch available: netty/netty netty-4.1.137.Final (PR #17217 merged 2026-08-06)

https://github.com/netty/netty/pull/17217
github_pr Patch Available

Merge changes from forks

Patch available: netty/netty netty-4.2.17.Final (PR #17213 merged 2026-08-04)

https://github.com/netty/netty/pull/17213
github_commit Patch Available

commit 1b5abc6443b6 (netty/netty)

Patch available: netty/netty netty-4.2.17.Final (contains commit 1b5abc6443b6)

https://github.com/netty/netty/commit/1b5abc6443b63726c72cdd285af2feb7ddbb8ff7

Vendor Advisories for CVE-2026-59902(2)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatnetty-transport-sctp2026-09-24redhat

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

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.48-10 ... 1:4.1.48-9 (12 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.48-10 ... 1:4.1.48-16 (8 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.48-10 ... 1:4.1.48-16 (7 versions)
  • every version on: no fix on record
—
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
io.netty:netty-transport-sctp4.0.0.Beta1 ... 4.1.99.Final (222 versions)
  • 4.2.0.Final up to 4.2.17.Final: fixed in 4.2.17.Final
  • every version up to 4.1.137.Final: fixed in 4.1.137.Final
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 64× 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.

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

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Frequently asked(5)

What is CVE-2026-59902?
CVE-2026-59902 is a high vulnerability published on August 17, 2026. Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.sctp.SctpMessageCompletionHandler limits incomplete messages and fragment counts but not maxBufferedBytes, allowing unauthenticated peers to exhaust memory with…
When was CVE-2026-59902 disclosed?
CVE-2026-59902 was first published on August 17, 2026, with the most recent update on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59902 actively exploited?
CVE-2026-59902 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59902?
CVE-2026-59902 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-59902?
A fix for CVE-2026-59902 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59902 are linked in the Vendor Advisories panel on this page.

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