CVE-2026-50560

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 78% 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, nvd
Trending — 3 sources updated this week
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty HTTP/2 max header size handling produces an attack similar to HTTP/2 Rapid Reset. There is a setting in the http2 specification called SETTINGS_MAX_HEADER_LIST_SIZE. When a client sends that setting to Netty, it appears that Netty will behave as follows: read the request; proxy the request to the origin; attempt to produce a response; and create an exception while writing the headers for the response. Functionally, this should be similar to the http2 reset attack, but with a different on-the-wire signature. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
21.9%
KEV
Not listed

Published

June 12, 2026

Last Modified

June 15, 2026

Advisory Details (4)

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

RFC 9113: HTTP/2

https://www.rfc-editor.org/rfc/rfc9113.html#name-defined-settings
github Patch Available

Netty susceptible to HTTP/2 Reset Attack with different on-the-wire signature · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-563q-j3cm-6jxm
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-2026-50560(3)

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-http22026-06-17redhat

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

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
io.netty:netty-codec-http24.1.0.Beta4 ... 4.1.99.Final (147 versions)4.1.135.Final—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 80× 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. 2026-07-07 01:09 UTCEG score recompute
  2. 2026-07-07 01:09 UTCVendor advisory
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 09:42 UTCEG score recompute
  6. 2026-07-05 09:42 UTCVendor advisory
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-04 10:56 UTCEG score recompute
  9. 2026-07-04 10:56 UTCVendor advisory
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-03 09:49 UTCEG score recompute
  12. 2026-07-03 09:49 UTCVendor advisory
  13. 2026-07-02 11:21 UTCEG score recompute
  14. 2026-07-02 11:21 UTCVendor advisory
  15. 2026-07-01 15:07 UTCEPSS rescore
  16. 2026-07-01 12:34 UTCEG score recompute
  17. 2026-07-01 12:34 UTCVendor advisory
  18. 2026-06-30 23:22 UTCEPSS rescore
  19. 2026-06-30 14:07 UTCEG score recompute
  20. 2026-06-30 14:07 UTCVendor advisory
  21. 2026-06-29 15:32 UTCEG score recompute
  22. 2026-06-29 15:32 UTCVendor advisory
  23. 2026-06-29 14:06 UTCEPSS rescore
  24. 2026-06-29 14:06 UTCEPSS rescore
  25. 2026-06-28 17:02 UTCEG score recompute
Show 55 more
  1. 2026-06-28 17:02 UTCVendor advisory
  2. 2026-06-28 14:07 UTCEPSS rescore
  3. 2026-06-28 04:56 UTCEPSS rescore
  4. 2026-06-28 04:56 UTCEPSS rescore
  5. 2026-06-27 18:35 UTCEG score recompute
  6. 2026-06-27 18:35 UTCVendor advisory
  7. 2026-06-27 03:08 UTCEPSS rescore
  8. 2026-06-26 20:07 UTCEG score recompute
  9. 2026-06-26 20:07 UTCVendor advisory
  10. 2026-06-25 21:41 UTCEG score recompute
  11. 2026-06-25 21:41 UTCVendor advisory
  12. 2026-06-25 13:49 UTCEPSS rescore
  13. 2026-06-24 23:14 UTCEG score recompute
  14. 2026-06-24 23:14 UTCVendor advisory
  15. 2026-06-24 14:05 UTCEPSS rescore
  16. 2026-06-24 00:46 UTCEG score recompute
  17. 2026-06-24 00:46 UTCVendor advisory
  18. 2026-06-23 21:33 UTCEPSS rescore
  19. 2026-06-23 21:33 UTCEPSS rescore
  20. 2026-06-23 02:19 UTCEG score recompute
  21. 2026-06-23 02:19 UTCVendor advisory
  22. 2026-06-22 14:25 UTCEPSS rescore
  23. 2026-06-22 14:25 UTCEPSS rescore
  24. 2026-06-22 03:52 UTCEG score recompute
  25. 2026-06-22 03:52 UTCVendor advisory
  26. 2026-06-21 14:56 UTCEPSS rescore
  27. 2026-06-21 14:56 UTCEPSS rescore
  28. 2026-06-21 04:44 UTCEG score recompute
  29. 2026-06-21 04:44 UTCVendor advisory
  30. 2026-06-21 01:59 UTCEPSS rescore
  31. 2026-06-21 01:59 UTCEPSS rescore
  32. 2026-06-20 06:09 UTCEG score recompute
  33. 2026-06-20 06:09 UTCVendor advisory
  34. 2026-06-19 19:26 UTCEPSS rescore
  35. 2026-06-19 19:26 UTCEPSS rescore
  36. 2026-06-19 07:41 UTCEG score recompute
  37. 2026-06-19 07:41 UTCVendor advisory
  38. 2026-06-18 17:52 UTCEPSS rescore
  39. 2026-06-18 17:52 UTCEPSS rescore
  40. 2026-06-18 09:10 UTCEG score recompute
  41. 2026-06-17 17:53 UTCEPSS rescore
  42. 2026-06-17 10:32 UTCEG score recompute
  43. 2026-06-16 17:53 UTCEPSS rescore
  44. 2026-06-16 12:05 UTCEG score recompute
  45. 2026-06-15 17:49 UTCEPSS rescore
  46. 2026-06-15 17:49 UTCEPSS rescore
  47. 2026-06-15 13:37 UTCEG score recompute▼ 1.60
  48. 2026-06-15 03:24 UTCNVD updateCVSS v3 → 5.3
  49. 2026-06-14 23:18 UTCEPSS rescore
  50. 2026-06-14 15:10 UTCEG score recompute
  51. 2026-06-13 23:00 UTCEPSS rescore
  52. 2026-06-13 16:42 UTCEG score recompute
  53. 2026-06-12 23:12 UTCEPSS rescore
  54. 2026-06-12 18:13 UTCEG score recompute
  55. 2026-06-12 18:13 UTCNVD updatefirst tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-50560?
CVE-2026-50560 is a medium vulnerability published on June 12, 2026. Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty HTTP/2 max header size handling produces an attack similar to HTTP/2 Rapid Reset. There is a setting in the http2 specification called…
When was CVE-2026-50560 disclosed?
CVE-2026-50560 was first published in the National Vulnerability Database on June 12, 2026, with the most recent update on June 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50560 actively exploited?
CVE-2026-50560 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 21.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-50560?
CVE-2026-50560 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-50560?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50560, 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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