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Home/Vulnerability/CVE-2026-50009

CVE-2026-50009

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

Published: Jun 12, 2026Updated: Jun 12, 2026 Sources: CVE List
NVD MITRE
4.8CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:LI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:LAvailability
Low

Weaknesses

CWE-200CWE-200: Exposure of Sensitive Information to an Unauthorized ActorCWE-330CWE-330: Use of Insufficiently Random Values

Affected Products

netty
netty
OSS Libraries / generic-library
nettyoss-projectOSS Librariesaka io.netty:netty, netty-incubator-codec-ohttp

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Collection
Credential Access
View detailed technique mapping

References

https://github.com/netty/netty/security/advisories/GHSA-cq4q-cv5g-r8q5
github.com
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
github.com

Timeline

Published
Jun 12, 2026
Last Updated
Jun 12, 2026

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