GHSA-5x3r-wrvg-rp6q

Suggest an improvement
Source
https://github.com/advisories/GHSA-5x3r-wrvg-rp6q
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-5x3r-wrvg-rp6q/GHSA-5x3r-wrvg-rp6q.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-5x3r-wrvg-rp6q
Aliases
  • CVE-2026-47244
Downstream
Related
Published
2026-06-08T23:02:40Z
Modified
2026-06-12T19:45:11.465768339Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
Netty HTTP/2: Advertised MAX_CONCURRENT_STREAMS are not enforced
Details

Impact

DefaultHttp2Connection.DefaultEndpoint initialises maxActiveStreams/maxStreams to Integer.MAXVALUE, and Http2Settings never inserts SETTINGSMAXCONCURRENTSTREAMS 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

Database specific 
{
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-08T23:02:40Z",
    "nvd_published_at": "2026-06-12T15:16:29Z",
    "severity": "MODERATE",
    "cwe_ids": [
        "CWE-400"
    ]
}
References

Affected packages

Maven / io.netty:netty-codec-http2

Package

Name
io.netty:netty-codec-http2
View open source insights on deps.dev
Purl
pkg:maven/io.netty/netty-codec-http2

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.2.0.Final
Fixed
4.2.15.Final

Affected versions

4.*
4.2.0.Final
4.2.1.Final
4.2.2.Final
4.2.3.Final
4.2.4.Final
4.2.5.Final
4.2.6.Final
4.2.7.Final
4.2.8.Final
4.2.9.Final
4.2.10.Final
4.2.11.Final
4.2.12.Final
4.2.13.Final
4.2.14.Final

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-5x3r-wrvg-rp6q/GHSA-5x3r-wrvg-rp6q.json"
last_known_affected_version_range 
"<= 4.2.14.Final"

Maven / io.netty:netty-codec-http2

Package

Name
io.netty:netty-codec-http2
View open source insights on deps.dev
Purl
pkg:maven/io.netty/netty-codec-http2

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.1.135.Final

Affected versions

4.*
4.1.0.Beta4
4.1.0.Beta5
4.1.0.Beta6
4.1.0.Beta7
4.1.0.Beta8
4.1.0.CR1
4.1.0.CR2
4.1.0.CR3
4.1.0.CR4
4.1.0.CR5
4.1.0.CR6
4.1.0.CR7
4.1.0.Final
4.1.1.Final
4.1.2.Final
4.1.3.Final
4.1.4.Final
4.1.5.Final
4.1.6.Final
4.1.7.Final
4.1.8.Final
4.1.9.Final
4.1.10.Final
4.1.11.Final
4.1.12.Final
4.1.13.Final
4.1.14.Final
4.1.15.Final
4.1.16.Final
4.1.17.Final
4.1.18.Final
4.1.19.Final
4.1.20.Final
4.1.21.Final
4.1.22.Final
4.1.23.Final
4.1.24.Final
4.1.25.Final
4.1.26.Final
4.1.27.Final
4.1.28.Final
4.1.29.Final
4.1.30.Final
4.1.31.Final
4.1.32.Final
4.1.33.Final
4.1.34.Final
4.1.35.Final
4.1.36.Final
4.1.37.Final
4.1.38.Final
4.1.39.Final
4.1.40.Final
4.1.41.Final
4.1.42.Final
4.1.43.Final
4.1.44.Final
4.1.45.Final
4.1.46.Final
4.1.47.Final
4.1.48.Final
4.1.49.Final
4.1.50.Final
4.1.51.Final
4.1.52.Final
4.1.53.Final
4.1.54.Final
4.1.55.Final
4.1.56.Final
4.1.57.Final
4.1.58.Final
4.1.59.Final
4.1.60.Final
4.1.61.Final
4.1.62.Final
4.1.63.Final
4.1.64.Final
4.1.65.Final
4.1.66.Final
4.1.67.Final
4.1.68.Final
4.1.69.Final
4.1.70.Final
4.1.71.Final
4.1.72.Final
4.1.73.Final
4.1.74.Final
4.1.75.Final
4.1.76.Final
4.1.77.Final
4.1.78.Final
4.1.79.Final
4.1.80.Final
4.1.81.Final
4.1.82.Final
4.1.83.Final
4.1.84.Final
4.1.85.Final
4.1.86.Final
4.1.87.Final
4.1.88.Final
4.1.89.Final
4.1.90.Final
4.1.91.Final
4.1.92.Final
4.1.93.Final
4.1.94.Final
4.1.95.Final
4.1.96.Final
4.1.97.Final
4.1.98.Final
4.1.99.Final
4.1.100.Final
4.1.101.Final
4.1.102.Final
4.1.103.Final
4.1.104.Final
4.1.105.Final
4.1.106.Final
4.1.107.Final
4.1.108.Final
4.1.109.Final
4.1.110.Final
4.1.111.Final
4.1.112.Final
4.1.113.Final
4.1.114.Final
4.1.115.Final
4.1.116.Final
4.1.117.Final
4.1.118.Final
4.1.119.Final
4.1.120.Final
4.1.121.Final
4.1.122.Final
4.1.123.Final
4.1.124.Final
4.1.125.Final
4.1.126.Final
4.1.127.Final
4.1.128.Final
4.1.129.Final
4.1.130.Final
4.1.131.Final
4.1.132.Final
4.1.133.Final
4.1.134.Final

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-5x3r-wrvg-rp6q/GHSA-5x3r-wrvg-rp6q.json"
last_known_affected_version_range 
"<= 4.1.134.Final"