GHSA-5x3r-wrvg-rp6q - Vulnerability details

5.3/10

CVSS 3.1

GHSA-5x3r-wrvg-rp6q

resolved Published 2026-06-08 Updated 2026-06-12

GitHub Advisory

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Vulnerability Data from Dependency-Track

Affected versions

5.7

5.7.2 5.7.1 5.7.0

5.6

5.6.1 5.6.0

5.5

5.5.19 5.5.18 5.5.17 5.5.16 5.5.15 5.5.14 5.5.13 5.5.12 5.5.11 5.5.10 5.5.9 5.5.8 5.5.7 5.5.6 5.5.5 5.5.4 5.5.3 5.5.2 5.5.1 5.5.0

5.4

5.4.13 5.4.12 5.4.11 5.4.10 5.4.9 5.4.8 5.4.7 5.4.6 5.4.5 5.4.4 5.4.3 5.4.2 5.4.1 5.4.0

Fixed in versions 5.7.3 and 5.6.2 No fix yet in 5.5, 5.4

Score

5.3 CVSS 3.1 GITHUB CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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

Same vulnerability as

CVE-2026-47244 resolved according to EUVD-2026-36455

Analysis Read only

State

Justification

Recommandation

Workaround

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