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Netty CVE-2026-59903

| EUVDEUVD-2026-60318 MEDIUM
Use of Cache Containing Sensitive Information (CWE-524)
2026-08-17 GitHub_M GHSA-8c42-7qj2-3j46
Information Disclosure Netty Suse
6.5
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
6.5 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
vuln.today AI
6.5 MEDIUM

Network vector as exploitation flows through CDN; AC:H because caching proxy deployment and application-set Vary headers must both be present; C:H for cross-user authenticated data disclosure.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

Lifecycle Timeline

4
Patch available
Aug 17, 2026 - 19:18 EUVD
Source Code Evidence Fetched
Aug 17, 2026 - 18:41 vuln.today
Analysis Generated
Aug 17, 2026 - 18:41 vuln.today
CVE Published
Aug 17, 2026 - 17:56 cve.org
MEDIUM 6.5

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 344 maven packages depend on io.netty:netty-codec-http (32 direct, 312 indirect)

Ecosystem-wide dependent count for version 4.2.0.Final.

DescriptionCVE.org

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.

AnalysisAI

Netty's CorsHandler silently overwrites any application-set Vary headers with only 'Vary: Origin', enabling caching proxies and CDNs to conflate and serve authenticated, user-specific HTTP responses to unauthorized requesters. Affected are all Netty deployments running netty-codec-http prior to 4.1.137.Final or 4.2.17.Final where applications set per-user Vary headers (e.g., Vary: Authorization or Vary: Cookie) and are deployed behind a caching layer. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Three conditions must be simultaneously true for exploitation: (1) the Netty application is configured with io.netty.handler.codec.http.cors.CorsHandler active in its pipeline, meaning CORS support is explicitly enabled; (2) the backend application or a pipeline handler sets an HTTP Vary header containing at least one auth-sensitive field such as Authorization or Cookie, intending to partition cached responses per-user; and (3) the application is deployed behind a caching proxy or CDN that caches HTTP responses and uses Vary headers as part of its cache key logic. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD CVSS 6.5 vector (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N) accurately captures that exploitation requires a high-complexity conjunction of conditions - a caching proxy or CDN in the request path AND the backend application explicitly setting per-user Vary headers - which substantially limits real-world blast radius despite the C:H confidentiality rating. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade io.netty:netty-codec-http to 4.1.137.Final (https://github.com/netty/netty/releases/tag/netty-4.1.137.Final) or 4.2.17.Final (https://github.com/netty/netty/releases/tag/netty-4.2.17.Final), both confirmed released by the vendor. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 Affected

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CVE-2026-59903 vulnerability details – vuln.today
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