CVE-2026-48043

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 56% 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: cna:github_m, epss
Trending — Patch released this week
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

Netty is a network application framework for development of protocol servers and clients. In netty-codec-http2 prior to versions 4.1.135.Final and 4.2.15.Final, the DelegatingDecompressorFrameListener class orchestrates HTTP/2 decompression by embedding a per-stream EmbeddedChannel that runs the appropriate decompression codec (gzip, deflate, zstd) and forwards decompressed chunks to a wrapped listener. Each decompressed chunk is a pooled ByteBuf handed to an anonymous ChannelInboundHandlerAdapter tail handler, which becomes the sole owner responsible for releasing it. A remote peer could send frames that would result in the flow-controller throwing and so trigger a resource leak which at the end might take down the whole JVM due OOME. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
44.1%
KEV
Not listed

Published

June 11, 2026

Last Modified

July 6, 2026

Advisory Details (3)

Auto-updated Jun 13, 2026
Patch available. Sources: github_release, github.
github Patch Available

[codec-http2] ByteBuf Reference-Count Leak in DelegatingDecompressorFrameListener Leads to Memory Exhaustion · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-c2gf-v879-257j
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-2026-48043(5)

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-http22026-07-02redhat

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-http24.2.0.Alpha1 ... 4.2.9.Final (25 versions)4.2.15.Final—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 33× in last 7d / 119× 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 119 total refreshes for this CVE.

  1. 2026-07-07 03:10 UTCEG score recompute▼ 2.20
  2. 2026-07-07 03:10 UTCVendor advisory
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 13:07 UTCMITRE cvelistV5CVSS v3 → 5.3 · severity → MEDIUM
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-05 22:19 UTCEG score recompute
  7. 2026-07-05 22:19 UTCVendor advisory
  8. 2026-07-05 11:05 UTCEG score recompute
  9. 2026-07-05 11:05 UTCVendor advisory
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-04 22:47 UTCEG score recompute
  12. 2026-07-04 22:47 UTCVendor advisory
  13. 2026-07-04 11:26 UTCEG score recompute
  14. 2026-07-04 11:26 UTCVendor advisory
  15. 2026-07-04 06:31 UTCEPSS rescore
  16. 2026-07-03 14:49 UTCEG score recompute
  17. 2026-07-03 14:49 UTCVendor advisory
  18. 2026-07-03 02:12 UTCEG score recompute
  19. 2026-07-03 02:12 UTCVendor advisory
  20. 2026-07-02 14:55 UTCEG score recompute
  21. 2026-07-02 14:55 UTCVendor advisory
  22. 2026-07-02 03:40 UTCEG score recompute
  23. 2026-07-02 03:40 UTCVendor advisory
  24. 2026-07-01 16:24 UTCEG score recompute
  25. 2026-07-01 16:24 UTCVendor advisory
Show 75 more
  1. 2026-07-01 15:07 UTCEPSS rescore
  2. 2026-07-01 05:09 UTCEG score recompute
  3. 2026-07-01 05:09 UTCVendor advisory
  4. 2026-06-30 23:22 UTCEPSS rescore
  5. 2026-06-30 17:37 UTCEG score recompute
  6. 2026-06-30 17:37 UTCVendor advisory
  7. 2026-06-30 06:22 UTCEG score recompute
  8. 2026-06-30 06:22 UTCVendor advisory
  9. 2026-06-29 19:06 UTCEG score recompute
  10. 2026-06-29 19:06 UTCVendor advisory
  11. 2026-06-29 14:06 UTCEPSS rescore
  12. 2026-06-29 14:06 UTCEPSS rescore
  13. 2026-06-29 07:48 UTCEG score recompute
  14. 2026-06-29 07:48 UTCVendor advisory
  15. 2026-06-28 20:29 UTCEG score recompute
  16. 2026-06-28 20:29 UTCVendor advisory
  17. 2026-06-28 14:07 UTCEPSS rescore
  18. 2026-06-28 09:14 UTCEG score recompute
  19. 2026-06-28 09:14 UTCVendor advisory
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-28 04:56 UTCEPSS rescore
  22. 2026-06-27 21:58 UTCEG score recompute
  23. 2026-06-27 21:58 UTCVendor advisory
  24. 2026-06-27 10:42 UTCEG score recompute
  25. 2026-06-27 10:42 UTCVendor advisory
  26. 2026-06-27 03:08 UTCEPSS rescore
  27. 2026-06-26 23:26 UTCEG score recompute
  28. 2026-06-26 23:26 UTCVendor advisory
  29. 2026-06-26 12:11 UTCEG score recompute
  30. 2026-06-26 12:11 UTCVendor advisory
  31. 2026-06-25 23:15 UTCEG score recompute
  32. 2026-06-25 23:15 UTCVendor advisory
  33. 2026-06-25 13:49 UTCEPSS rescore
  34. 2026-06-25 12:00 UTCEG score recompute
  35. 2026-06-25 12:00 UTCVendor advisory
  36. 2026-06-25 00:45 UTCEG score recompute
  37. 2026-06-25 00:45 UTCVendor advisory
  38. 2026-06-24 14:05 UTCEPSS rescore
  39. 2026-06-24 13:31 UTCEG score recompute
  40. 2026-06-24 13:31 UTCVendor advisory
  41. 2026-06-24 02:09 UTCEG score recompute
  42. 2026-06-24 02:09 UTCVendor advisory
  43. 2026-06-23 21:33 UTCEPSS rescore
  44. 2026-06-23 21:33 UTCEPSS rescore
  45. 2026-06-23 14:54 UTCEG score recompute
  46. 2026-06-23 14:54 UTCVendor advisory
  47. 2026-06-23 03:15 UTCEG score recompute
  48. 2026-06-23 03:15 UTCVendor advisory
  49. 2026-06-22 15:43 UTCEG score recompute
  50. 2026-06-22 15:43 UTCVendor advisory
  51. 2026-06-22 14:25 UTCEPSS rescore
  52. 2026-06-22 14:25 UTCEPSS rescore
  53. 2026-06-22 04:07 UTCEG score recompute
  54. 2026-06-22 04:07 UTCVendor advisory
  55. 2026-06-21 16:51 UTCEG score recompute
  56. 2026-06-21 16:51 UTCVendor advisory
  57. 2026-06-21 14:56 UTCEPSS rescore
  58. 2026-06-21 14:56 UTCEPSS rescore
  59. 2026-06-21 04:50 UTCEG score recompute
  60. 2026-06-21 04:50 UTCVendor advisory
  61. 2026-06-21 01:59 UTCEPSS rescore
  62. 2026-06-21 01:59 UTCEPSS rescore
  63. 2026-06-20 17:18 UTCEG score recompute
  64. 2026-06-20 17:18 UTCVendor advisory
  65. 2026-06-20 06:02 UTCEG score recompute
  66. 2026-06-20 06:02 UTCVendor advisory
  67. 2026-06-19 19:26 UTCEPSS rescore
  68. 2026-06-19 19:26 UTCEPSS rescore
  69. 2026-06-19 18:02 UTCEG score recompute
  70. 2026-06-19 18:02 UTCVendor advisory
  71. 2026-06-19 06:06 UTCEG score recompute
  72. 2026-06-19 06:06 UTCVendor advisory
  73. 2026-06-18 18:22 UTCEG score recompute
  74. 2026-06-18 18:22 UTCVendor advisory
  75. 2026-06-18 17:52 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-48043?
CVE-2026-48043 is a medium vulnerability published on June 11, 2026. Netty is a network application framework for development of protocol servers and clients. In netty-codec-http2 prior to versions 4.1.135.Final and 4.2.15.Final, the DelegatingDecompressorFrameListener class orchestrates HTTP/2 decompression by embedding a per-stream EmbeddedChannel that runs the…
When was CVE-2026-48043 disclosed?
CVE-2026-48043 was first published in the National Vulnerability Database on June 11, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48043 actively exploited?
CVE-2026-48043 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 44.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-48043?
CVE-2026-48043 has a CVSS v4.0 base score of 5.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-48043?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48043, 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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