CVE-2026-46340

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-08. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week

Also known asEUVD-2026-36451 (ENISA EUVD) · GHSA-5xrh-qmmq-w6ch (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%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 impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
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
0.6%
EPSS %ILE
49th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 8, 2026

Last Modified

September 18, 2026

Advisory Details (3)

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

Patch Availability(7)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhateap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el7eap2026-08-11redhat
redhatio.netty/netty-transport-sctp:4.1.135.Final-redhat-000012026-08-11redhat
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
redhatnetty-transport-sctp2026-08-04redhat
mavenio.netty:netty-transport-sctp @ 4.2.15.Final (fixes >= 4.2.0.Final, <= 4.2.14.Final)—ghsa
mavenio.netty:netty-transport-sctp @ 4.1.135.Final (fixes <= 4.1.134.Final)—ghsa

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.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 43× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 250 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 150 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  2. 2026-11-01 07:48 UTCGHSA enrichmentGHSA-5xrh-qmmq-w6ch · GitHub severity HIGH · GitHub CVSS 7.5
  3. 2026-11-01 07:48 UTCEG score recompute
  4. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  5. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  6. 2026-10-30 13:59 UTCEG score recompute
  7. 2026-10-30 13:59 UTCVendor advisory
  8. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  9. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  10. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  11. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  12. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  13. 2026-10-25 14:25 UTCEG score recompute
  14. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  15. 2026-10-24 01:41 UTCEG score recompute
  16. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  17. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  18. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  19. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  20. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  21. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  22. 2026-10-18 03:37 UTCEG score recompute
  23. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  24. 2026-10-17 13:23 UTCEG score recompute
  25. 2026-10-17 13:23 UTCVendor advisory
Show 75 more
  1. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  2. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  3. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  4. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  5. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  6. 2026-10-12 16:03 UTCEG score recompute
  7. 2026-10-11 19:45 UTCEG score recompute
  8. 2026-10-11 17:00 UTCEG score recompute
  9. 2026-10-11 14:25 UTCEG score recompute
  10. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  11. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  13. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  14. 2026-10-08 07:35 UTCOSV refresh
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  18. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  24. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  25. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  26. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  27. 2026-09-18 13:23 UTCEG score recompute
  28. 2026-09-18 13:23 UTCVendor advisory
  29. 2026-09-18 12:19 UTCEG score recompute
  30. 2026-09-18 12:19 UTCVendor advisory
  31. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  32. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  33. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  34. 2026-09-14 04:47 UTCEG score recompute
  35. 2026-09-14 04:47 UTCVendor advisory
  36. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  37. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  38. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  39. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  40. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  41. 2026-09-09 13:40 UTCEG score recompute
  42. 2026-09-09 13:40 UTCVendor advisory
  43. 2026-09-09 12:38 UTCEG score recompute
  44. 2026-09-09 12:38 UTCVendor advisory
  45. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  46. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  47. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  48. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  49. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  50. 2026-09-02 13:38 UTCEG score recompute
  51. 2026-09-02 13:38 UTCVendor advisory
  52. 2026-09-02 12:38 UTCEG score recompute
  53. 2026-09-02 12:38 UTCVendor advisory
  54. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  55. 2026-08-31 01:35 UTCEG score recompute
  56. 2026-08-31 01:35 UTCVendor advisory
  57. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  58. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  59. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  60. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  61. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  62. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  63. 2026-08-25 01:13 UTCEG score recompute
  64. 2026-08-25 01:13 UTCVendor advisory
  65. 2026-08-23 23:46 UTCVendor advisory
  66. 2026-08-23 11:36 UTCEG score recompute
  67. 2026-08-23 11:36 UTCVendor advisory
  68. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  69. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  70. 2026-08-21 19:52 UTCVendor advisory
  71. 2026-08-21 07:51 UTCEG score recompute
  72. 2026-08-21 07:51 UTCVendor advisory
  73. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  74. 2026-08-20 20:54 UTCVendor advisory
  75. 2026-08-20 09:26 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-46340?
CVE-2026-46340 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-46340 published?
The CVE record for CVE-2026-46340 was published on June 8, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-46340 actively exploited?
CVE-2026-46340 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (49th 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.

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