요약
- CVE-2026-47244은(는) io.netty:netty-codec-http2, netty (netty)에 영향을 주는 보통 (CVSS 5.3) 취약점입니다.
- 향후 30일 내 악용 확률(EPSS): 0.38%, 전체 취약점의 32.5%보다 높음.
- 조치: 4.2.15.Final, 4.1.135.Final, 4.2.15, 4.1.135 이상으로 업데이트하세요.
| Package | Affected versions | Patched versions |
|---|
| io.netty:netty-codec-http2 Maven | ≥ 4.2.0.Final, < 4.2.15.Final< 4.1.135.Final
| 4.2.15.Final4.1.135.Final
|
| netty | ≥ 4.2.0, < 4.2.15< 4.1.135
| 4.2.154.1.135
|
Description
Impact
DefaultHttp2Connection.DefaultEndpoint initialises maxActiveStreams/maxStreams to Integer.MAX_VALUE, and Http2Settings never inserts SETTINGS_MAX_CONCURRENT_STREAMS by default (Http2Settings.java:305-307 only clamps a user-supplied value). Unless the application explicitly calls initialSettings().maxConcurrentStreams(n), a Netty HTTP/2 server advertises no limit and enforces none locally. Each open stream allocates a DefaultStream object, PropertyMap slots, flow-controller state and IntObjectHashMap entry; with ~2^30 permissible odd stream IDs a single TCP connection can create hundreds of thousands of long-lived stream objects. This is also the precondition for CVE-2023-44487-style Rapid-Reset amplification, where the absence of a low concurrent cap multiplies backend work.
Resources
https://www.rfc-editor.org/rfc/rfc7540.html#section-6.5.2
NVD description
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, DefaultHttp2Connection.DefaultEndpoint initialises maxActiveStreams/maxStreams to Integer.MAX_VALUE, and Http2Settings never inserts SETTINGS_MAX_CONCURRENT_STREAMS by default (Http2Settings.java:305-307 only clamps a user-supplied value). Unless the application explicitly calls initialSettings().maxConcurrentStreams(n), a Netty HTTP/2 server advertises no limit and enforces none locally. Each open stream allocates a DefaultStream object, PropertyMap slots, flow-controller state and IntObjectHashMap entry; with ~2^30 permissible odd stream IDs a single TCP connection can create hundreds of thousands of long-lived stream objects. This is also the precondition for CVE-2023-44487-style Rapid-Reset amplification, where the absence of a low concurrent cap multiplies backend work. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
io.netty:netty-codec-http2의 다른 취약점
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