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: 0.4%, top 71% 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
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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)
EPSS
29.2%
KEV
Not listed

Published

June 8, 2026

Last Modified

June 30, 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(1)

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

Affected Packages

(1 across 1 ecosystem)
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 / 84× 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. 2026-07-06 16:27 UTCEPSS rescore
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  3. 2026-07-05 17:24 UTCEG score recompute
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  1. 2026-06-27 10:43 UTCEG score recompute
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  6. 2026-06-25 13:49 UTCEPSS rescore
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  10. 2026-06-24 14:05 UTCEPSS rescore
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  12. 2026-06-23 21:33 UTCEPSS rescore
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  22. 2026-06-21 01:59 UTCEPSS rescore
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  24. 2026-06-20 21:49 UTCEG score recompute
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  27. 2026-06-19 19:26 UTCEPSS rescore
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  35. 2026-06-17 17:53 UTCEPSS rescore
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  38. 2026-06-16 17:53 UTCEPSS rescore
  39. 2026-06-16 16:51 UTCEG score recompute
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  41. 2026-06-15 18:58 UTCEG score recompute
  42. 2026-06-15 17:49 UTCEPSS rescore
  43. 2026-06-15 08:01 UTCEG score recompute
  44. 2026-06-14 21:06 UTCEG score recompute
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  47. 2026-06-13 23:00 UTCEPSS rescore
  48. 2026-06-13 12:22 UTCEG score recompute
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  50. 2026-06-12 23:12 UTCEPSS rescore
  51. 2026-06-12 14:27 UTCEG score recompute
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  53. 2026-06-11 16:37 UTCEG score recompute
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  57. 2026-06-09 20:57 UTCEG score recompute
  58. 2026-06-09 10:02 UTCEG score recompute
  59. 2026-06-08 23:08 UTCEG score recompute

Related CVEs(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 June 30, 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 29.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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