GHSA-6cqp-g7gg-8hr5

Source

https://github.com/advisories/GHSA-6cqp-g7gg-8hr5

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-6cqp-g7gg-8hr5/GHSA-6cqp-g7gg-8hr5.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-6cqp-g7gg-8hr5

Aliases

CVE-2026-56746

Downstream

CGA (841)

MINI (97)

Published

2026-07-22T21:42:17Z

Modified

2026-09-10T03:51:10Z

Severity

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

Summary

Netty: Security Control Bypass via CORS Short-Circuit Failure

Details

Summary

Netty's CorsHandler provides a shortCircuit() configuration designed to reject unauthorized cross-origin requests immediately, acting as a security control before requests reach the application. However, due to a logical operator error in the origin evaluation process, this protection can be entirely bypassed. An attacker can bypass the short-circuit mechanism by sending a request with an Origin: null header. This failure forwards unauthorized requests to the backend application, bypassing intended access controls.

Details

In io.netty.handler.codec.http.cors.CorsHandler#channelRead, the short-circuit logic relies on the configuration returned by getForOrigin(origin) to determine if an origin is authorized. If getForOrigin returns a configuration object, the short-circuit check (!(origin == null || config != null)) is bypassed, and the request proceeds to the backend.

The vulnerability is located in the getForOrigin method:

            if (corsConfig.isNullOriginAllowed() || NULL_ORIGIN.equals(requestOrigin)) {
                return corsConfig;
            }

If an attacker sends Origin: null, NULL_ORIGIN.equals(requestOrigin) evaluates to true. The method returns the configuration object regardless of whether isNullOriginAllowed() was configured by the developer. The short-circuit is bypassed.

Impact

Applications relying on CorsHandler's short-circuit feature to prevent unauthorized cross-origin requests from reaching their backend logic are completely exposed. The framework fails to enforce the developer's intended access controls, allowing unauthorized requests to be processed.

Database specific

{
    "cwe_ids":  [
        "CWE-284"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-07-22T21:42:17Z",
    "nvd_published_at":  "2026-07-21T22:17:14Z",
    "severity":  "MODERATE"
}

References

Affected packages

Maven / io.netty:netty-codec-http

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

4.2.0.Final

Fixed

4.2.16.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

4.2.15.Final

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-6cqp-g7gg-8hr5/GHSA-6cqp-g7gg-8hr5.json"

Maven / io.netty:netty-codec-http

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

4.1.136.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

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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

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Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-6cqp-g7gg-8hr5/GHSA-6cqp-g7gg-8hr5.json"