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CVE-2026-59903— Netty: Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite

Quick assessment

Affected
netty netty
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netty是Netty团队开源的一个高性能网络通信框架。 Netty 4.1.137.Final之前版本和4.2.17.Final之前版本存在信息泄露漏洞，该漏洞源于setVaryHeader将应用程序Vary头替换为Origin，可能导致缓存代理或CDN跨用户重用已验证响应并泄露敏感信息。

CVSS 6.5 · Medium EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 2

VendorProduct Version RangeStatus
netty netty < 4.1.137.Final affected
>= 4.2.0.Final, < 4.2.17.Final affected
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I. Basic Information for CVE-2026-59903

Vulnerability Information
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Vulnerability Title
Netty: Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite
Source: CVE Program / CVE List V5
Vulnerability Description
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.http.cors.CorsHandler setVaryHeader replaces application Vary headers such as Authorization or Cookie with Origin, allowing a caching proxy or CDN to reuse authenticated responses across users and disclose sensitive information. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过缓存导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Netty 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netty是Netty团队开源的一个高性能网络通信框架。 Netty 4.1.137.Final之前版本和4.2.17.Final之前版本存在信息泄露漏洞，该漏洞源于setVaryHeader将应用程序Vary头替换为Origin，可能导致缓存代理或CDN跨用户重用已验证响应并泄露敏感信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
netty netty < 4.1.137.Final -

II. Public POCs for CVE-2026-59903

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III. Intelligence Information for CVE-2026-59903

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Patches & Fixes for CVE-2026-59903 (2)

Vendor Advisories for CVE-2026-59903 (1)

Vendor Pages for CVE-2026-59903 (1)

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-524

V. Comments for CVE-2026-59903

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