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TI-2026-36835 Aliases CVE-2026-50009GHSA-cq4q-cv5g-r8q5

Netty QUIC stateless reset token material exposed through header-visible connection IDs

Priority LOW 21CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00204 10th percentileScored 2026-11-07
Fix Fixed netty (netty): 4.2.15.Finalio.netty:netty-codec-classes-quic (Maven): 4.2.15.Final

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nettynetty4.2.0.Final to before 4.2.15.Final4.2.15.FinalPatch availableCNA
—io.netty:netty-codec-classes-quic (Maven)4.2.0.Final to before 4.2.15.Final4.2.15.FinalPatch availableGHSA-cq4q-cv5g-r8q5
  • netty Vendornetty Affected 4.2.0.Final to before 4.2.15.Final Fixed in 4.2.15.Final Patch available CNA
  • io.netty:netty-codec-classes-quic (Maven) Vendor— Affected 4.2.0.Final to before 4.2.15.Final Fixed in 4.2.15.Final Patch available GHSA-cq4q-cv5g-r8q5

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*4.2.0 to before 4.2.15Vulnerablenetty
  • cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* Versions 4.2.0 to before 4.2.15 Vulnerable ·netty

Remediation

  • Fix · CNA netty (netty) Fixed in 4.2.15.Final
  • Fix · GHSA-cq4q-cv5g-r8q5 io.netty:netty-codec-classes-quic (Maven) Fixed in 4.2.15.Final Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-50009
  2. 2026-10-03 Alias added: GHSA-cq4q-cv5g-r8q5

References

Advisory 2

Other 2

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2026-30861 Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization CVSS 3.1CRITICAL 9.8
  • TI-2026-30864 Netty: HttpClientCodec response desynchronization CVSS 3.1CRITICAL 9.1
  • TI-2026-30859 Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder) CVSS 3.1CRITICAL 9.1
  • TI-2026-40973 Netty: Missing CertificateID Validation in OCSP Response Allows Replay Attacks CVSS 3.1CRITICAL 9.1
  • TI-2026-40972 Uncontrolled resource consumption in netty CVSS 3.1HIGH 7.5
See all 92 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences