CVE-2026-46340

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: 0.6%, top 54% 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. In versions of netty-transport-sctp prior to 4.1.135.Final and 4.2.15.Final, for each non-complete SctpMessage fragment the handler does fragments.put(streamId, Unpooled.wrappedBuffer(frag, byteBuf)), wrapping the previous accumulator and the new slice into a *new* CompositeByteBuf every time. After N fragments the accumulator is an N-deep chain of composites, each holding references and component arrays; readableBytes()/getBytes() on the final buffer recurse N levels. There is no limit on N, on total bytes, or on the number of streamIdentifiers an attacker can open (each gets its own map entry). A peer that never sets the complete flag can grow this structure indefinitely from tiny 1-byte DATA chunks. 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
46%
KEV
Not listed

Published

June 8, 2026

Last Modified

August 12, 2026

Advisory Details (3)

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

SCTP reassembly nests buffers without bound · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-5xrh-qmmq-w6ch
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-2026-46340(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-transport-sctp2026-08-11redhat
redhateap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el7eap2026-08-11redhat

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-transport-sctp4.0.0.Beta1 ... 4.1.99.Final (220 versions)4.1.135.Final—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 102× 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 164 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-46340?
CVE-2026-46340 is a high vulnerability published on June 8, 2026. Netty is a network application framework for development of protocol servers and clients. In versions of netty-transport-sctp prior to 4.1.135.Final and 4.2.15.Final, for each non-complete SctpMessage fragment the handler does fragments.put(streamId, Unpooled.wrappedBuffer(frag, byteBuf)), wrapping…
When was CVE-2026-46340 disclosed?
CVE-2026-46340 was first published in the National Vulnerability Database on June 8, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46340 actively exploited?
CVE-2026-46340 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 53.7% of all scored CVEs.
What is the CVSS score of CVE-2026-46340?
CVE-2026-46340 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-46340?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46340, 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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