GHSA-8c42-7qj2-3j46

Source

https://github.com/advisories/GHSA-8c42-7qj2-3j46

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-8c42-7qj2-3j46/GHSA-8c42-7qj2-3j46.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-8c42-7qj2-3j46

Aliases

CVE-2026-59903

Downstream

CGA (1407)

MINI (80)

Published

2026-08-17T18:24:26Z

Modified

2026-08-17T18:41:14Z

Severity

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

Summary

Netty Vulnerable to Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite

Details

Summary

Netty's CorsHandler silently overwrites existing Vary headers, enabling cache poisoning and sensitive information disclosure.

Details

io.netty.handler.codec.http.cors.CorsHandler#setVaryHeader overwrites any existing Vary headers set by backend applications.

    private static void setVaryHeader(final HttpResponse response) {
        response.headers().set(HttpHeaderNames.VARY, HttpHeaderNames.ORIGIN);
    }

Because set() replaces all existing values for the header, if a backend application sets a Vary header (such as Vary: Authorization or Vary: Cookie) to ensure that intermediate caches (like CDNs) cache responses separately per user, the CorsHandler will overwrite it with Vary: origin. This causes the caching proxy to ignore the authorization context and cache the response based solely on the URL and Origin, allowing an attacker to retrieve another user's cached sensitive data.

Impact

This is a Cache Poisoning vulnerability that leads to Information Disclosure. It impacts any Netty-based web application that uses the CorsHandler, sets its own Vary headers to manage caching of authenticated or user-specific responses (e.g., Vary: Authorization), and is deployed behind a caching proxy or CDN. The end-users of these applications are impacted, as their sensitive data may be leaked to unauthorized actors.

Database specific

{
    "cwe_ids":  [
        "CWE-524"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-08-17T18:24:26Z",
    "nvd_published_at":  null,
    "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

4.2.17.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

4.2.16.Final

Database specific

last_known_affected_version_range

"<= 4.2.16.Final"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-8c42-7qj2-3j46/GHSA-8c42-7qj2-3j46.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

4.1.137.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

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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

4.1.9.Final

4.1.10.Final

4.1.11.Final

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4.1.56.Final

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4.1.125.Final

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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

4.1.135.Final

4.1.136.Final

Database specific

last_known_affected_version_range

"<= 4.1.136.Final"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-8c42-7qj2-3j46/GHSA-8c42-7qj2-3j46.json"