CVE-2026-44891

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 65% 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 weekElevated
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%CVSS: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.stomp.StompSubframeDecoder fails to limit the total number of headers or their cumulative size per frame, and the maxLineLength parameter only restricts individual header lines. An attacker can send a large number of short headers that are accumulated in memory inside DefaultStompHeadersSubframe until the JVM throws an OutOfMemoryError, causing denial of service for servers exposing a STOMP endpoint based on StompSubframeDecoder. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 23, 2026

Advisory Details (7)

Auto-updated Jul 17, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit, github_pr.
github Patch Available🟡 PoC Available

Denial of Service via Unbounded Headers in StompSubframeDecoder · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-vhch-2wf3-m8rp
github_release Patch Available

netty-4.2.16.Final

Patch available: netty/netty netty-4.2.16.Final

https://github.com/netty/netty/releases/tag/netty-4.2.16.Final
github_release Patch Available

netty-4.1.136.Final

Patch available: netty/netty netty-4.1.136.Final

https://github.com/netty/netty/releases/tag/netty-4.1.136.Final
github_pr Patch Available

Merge branches from forks (#17063)

Patch available: netty/netty netty-4.1.136.Final (PR #17065 merged 2026-07-08)

https://github.com/netty/netty/pull/17065
github_pr Patch Available

Merge branches from forks

Patch available: netty/netty netty-4.2.16.Final (PR #17063 merged 2026-07-06)

https://github.com/netty/netty/pull/17063
github_commit Patch Available

commit bb2ff68a1fb7 (netty/netty)

Patch available: netty/netty netty-4.1.136.Final (contains commit bb2ff68a1fb7)

https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6
github_commit Patch Available

commit 5b68c61f37aa (netty/netty)

Patch available: netty/netty netty-4.2.16.Final (contains commit 5b68c61f37aa)

https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b

Vendor Advisories for CVE-2026-44891(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 / EcosystemFixed in / PatchReleasedSource
redhatnetty-codec-stomp2026-08-13redhat

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-codec-stomp4.1.0.Beta1 ... 4.1.99.Final (151 versions)4.1.136.Final—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 21× 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.

Showing the most recent 100 of 107 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-44891?
CVE-2026-44891 is a high vulnerability published on July 14, 2026. Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.stomp.StompSubframeDecoder fails to limit the total number of headers or their cumulative size per frame, and the maxLineLength parameter only…
When was CVE-2026-44891 disclosed?
CVE-2026-44891 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44891 actively exploited?
CVE-2026-44891 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 64.8% of all scored CVEs.
What is the CVSS score of CVE-2026-44891?
CVE-2026-44891 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-44891?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44891, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-44891

Explore →

Is Your Infrastructure Affected by CVE-2026-44891?

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

Start Free Scan →Browse All CVEs