CVE-2026-50009

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 90% 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
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: None knownExposed: 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. Prior to version 4.2.15.Final, Netty QUIC exposes the stateless reset token on the network path when using the default HMAC-based connection-ID and stateless-reset-token generators. The reset token for the server's current source connection ID can be derived from bytes that appear as the connection ID in QUIC headers after a source-CID rotation. An on-path attacker observing the headers can use the token to perform a Denial of Service by sending a spoofed Stateless Reset packet. Version 4.2.15.Final patches the issue.

CVSS v3
4.8
EG Score
4.8(medium)
EG Risk
26(Track)
EG Risk 26/100SSVC: Track

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
Severity48% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

June 12, 2026

Last Modified

June 15, 2026

Advisory Details (2)

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

QUIC stateless reset token material exposed through header-visible connection IDs · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-cq4q-cv5g-r8q5
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

Vendor Advisories for CVE-2026-50009(1)

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

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-classes-quic4.2.1.Final ... 4.2.9.Final (14 versions)4.2.15.Final—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 47× 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 108 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-50009?
CVE-2026-50009 is a medium vulnerability published on June 12, 2026. Netty is a network application framework for development of protocol servers and clients. Prior to version 4.2.15.Final, Netty QUIC exposes the stateless reset token on the network path when using the default HMAC-based connection-ID and stateless-reset-token generators. The reset token for the…
When was CVE-2026-50009 disclosed?
CVE-2026-50009 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-2026-50009 actively exploited?
CVE-2026-50009 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 89.8% of all scored CVEs.
What is the CVSS score of CVE-2026-50009?
CVE-2026-50009 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-50009?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50009, 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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