GHSA-x4gw-5cx5-pgmh

Source

https://github.com/advisories/GHSA-x4gw-5cx5-pgmh

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-x4gw-5cx5-pgmh/GHSA-x4gw-5cx5-pgmh.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-x4gw-5cx5-pgmh

Aliases

CVE-2026-45416

Downstream

CGA (912)

MINI (122)

Published

2026-06-08T23:01:04Z

Modified

2026-07-17T21:17:14Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

Netty: SNI handler pre-allocates up to 16 MiB from nine attacker bytes

Details

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

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

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

last_known_affected_version_range

"<= 4.2.14.Final"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-x4gw-5cx5-pgmh/GHSA-x4gw-5cx5-pgmh.json"

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

0 Unknown 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

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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

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4.1.56.Final

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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

last_known_affected_version_range

"<= 4.1.134.Final"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-x4gw-5cx5-pgmh/GHSA-x4gw-5cx5-pgmh.json"