CVEvulnerability
CVE-2026-55831
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2026-07-21
- Last modified
- 2026-07-23
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-400, CWE-770
Description
Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final and 4.2.16.Final, Netty's SPDY SETTINGS decoder accepts a peer-declared SETTINGS entry count up to the 24-bit frame-length limit and materializes every unique setting ID in `DefaultSpdySettingsFrame`, allowing a remote SPDY/3.1 peer to send a syntactically valid roughly 2 MiB SETTINGS frame that creates 262144 map entries and amplifies network input into heap growth and ordered-map insertion work. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
Affected configurations
• netty netty (>= 4.1.0 < 4.1.136)
• netty netty (>= 4.2.0 < 4.2.16)
Related
References
- https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b Patch
- https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6 Patch
- https://github.com/netty/netty/releases/tag/netty-4.1.136.Final Release Notes
- https://github.com/netty/netty/releases/tag/netty-4.2.16.Final Release Notes
- https://github.com/netty/netty/security/advisories/GHSA-6jqx-86gh-f27w Exploit, Vendor Advisory
- https://github.com/netty/netty/security/advisories/GHSA-6jqx-86gh-f27w Exploit, Vendor Advisory