CVE-2026-50009 json
Netty QUIC stateless reset token material exposed through header-visible connection IDs
published 2026-06-12 4 mo ago modified 2026-09-10 1 mo ago also GHSA-cq4q-cv5g-r8q5 , EUVD-2026-36462
- cvss
- 4.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 10%
- public exploits
- 0
- none known
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.
Patch / fix
- maven io.netty:netty-codec-classes-quic 4.2.15.Final
- netty netty 4.2.15
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L |
| GitHub | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | io.netty:netty-codec-classes-quic | >=4.2.0.Final, <4.2.15.Final |
4.2.15.Final |
Affected products
- netty netty
Classification
References
-
github.com
/netty/netty/security/advisories/GHSA-cq4q-cv5g-r8q5
web, vendor-advisory
-
github.com
/netty/netty/releases/tag/netty-4.2.15.Final
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-50009
advisory
-
github.com
/netty/netty
package
Sources
- CVE List CVE-2026-50009
- GitHub Advisory GHSA-cq4q-cv5g-r8q5
- NVD CVE-2026-50009
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