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 53% 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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%
EPSS PROB
0.8%
EPSS %ILE
56th
KEV
Not listed

Published

June 8, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Jun 12, 2026
Patch available. Sources: github_release, github.
githubMentions a patch (unverified)

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(8)

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

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatnetty-transport-sctp2026-08-11redhat
redhateap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el8eap2026-08-11redhat
redhateap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el9eap2026-08-11redhat
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 rangeFix by version rangeDependents
netty1:4.1.48-10 ... 1:4.1.48-9 (16 versions)
  • every version on: no fix on record
—
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 (220 versions)
  • 4.2.0.Final up to 4.2.15.Final: fixed in 4.2.15.Final
  • every version up to 4.1.135.Final: fixed in 4.1.135.Final
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 29× 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 214 total refreshes for this CVE.

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

Related CVEs(same product + 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 on June 8, 2026, with the most recent update on September 18, 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 0.8% probability of exploitation in the next 30 days (56th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-46340?
CVE-2026-46340 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-2026-46340?
A fix for CVE-2026-46340 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-46340 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-46340

Explore →

Is Your Infrastructure Affected by CVE-2026-46340?

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

Book a Demo →Browse All CVEs