GHSA-x4gw-5cx5-pgmh

SslClientHelloHandler.decode() reads the 24-bit TLS handshake length and, when the ClientHello does not fit in the first record, eagerly allocates ctx.alloc().buffer(handshakeLength) (line 161). The guard at line 140 is handshakeLength > maxClientHelloLength && maxClientHelloLength != 0, and the commonly-used SniHandler/AbstractSniHandler constructors (SniHandler(Mapping), SniHandler(AsyncMapping), AbstractSniHandler()) pass maxClientHelloLength=0 and handshakeTimeoutMillis=0, so the length guard is disabled and no timeout is scheduled. A 16 MiB request exceeds the default pooled chunk size and becomes a huge/unpooled allocation performed immediately. The buffer is retained in the handler until the channel closes.

Database specific

{
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-08T23:01:04Z",
    "nvd_published_at": "2026-06-12T15:16:26Z",
    "severity": "HIGH",
    "cwe_ids": [
        "CWE-770"
    ]
}

References

Affected packages

Maven / io.netty:netty-handler

Package

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

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-x4gw-5cx5-pgmh/GHSA-x4gw-5cx5-pgmh.json"

last_known_affected_version_range

"<= 4.2.14.Final"

Maven / io.netty:netty-handler

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.1.135.Final

Affected versions

4.*

4.0.0.Alpha1

4.0.0.Alpha2

4.0.0.Alpha3

4.0.0.Alpha4

4.0.0.Alpha5

4.0.0.Alpha6

4.0.0.Alpha7

4.0.0.Alpha8

4.0.0.Beta1

4.0.0.Beta2

4.0.0.Beta3

4.0.0.CR1

4.0.0.CR2

4.0.0.CR3

4.0.0.CR4

4.0.0.CR5

4.0.0.CR6

4.0.0.CR7

4.0.0.CR8

4.0.0.CR9

4.0.0.Final

4.0.1.Final

4.0.2.Final

4.0.3.Final

4.0.4.Final

4.0.5.Final

4.0.6.Final

4.0.7.Final

4.0.8.Final

4.0.9.Final

4.0.10.Final

4.0.11.Final

4.0.12.Final

4.0.13.Final

4.0.14.Beta1

4.0.14.Final

4.0.15.Final

4.0.16.Final

4.0.17.Final

4.0.18.Final

4.0.19.Final

4.0.20.Final

4.0.21.Final

4.0.22.Final

4.0.23.Final

4.0.24.Final

4.0.25.Final

4.0.26.Final

4.0.27.Final

4.0.28.Final

4.0.29.Final

4.0.30.Final

4.0.31.Final

4.0.32.Final

4.0.33.Final

4.0.34.Final

4.0.35.Final

4.0.36.Final

4.0.37.Final

4.0.38.Final

4.0.39.Final

4.0.40.Final

4.0.41.Final

4.0.42.Final

4.0.43.Final

4.0.44.Final

4.0.45.Final

4.0.46.Final

4.0.47.Final

4.0.48.Final

4.0.49.Final

4.0.50.Final

4.0.51.Final

4.0.52.Final

4.0.53.Final

4.0.54.Final

4.0.55.Final

4.0.56.Final

4.1.0.Beta1

4.1.0.Beta2

4.1.0.Beta3

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-x4gw-5cx5-pgmh/GHSA-x4gw-5cx5-pgmh.json"

last_known_affected_version_range

"<= 4.1.134.Final"