{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-59903","sourceIdentifier":"security-advisories@github.com","published":"2026-08-17T18:17:36.250","lastModified":"2026-09-23T15:21:27.670","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"netty","product":"netty","versions":[{"version":"\u003c 4.1.137.Final","status":"affected"},{"version":"\u003e= 4.2.0.Final, \u003c 4.2.17.Final","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.2,"impactScore":4.2},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-17T18:13:26.781284Z","id":"CVE-2026-59903","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-524"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*","versionEndExcluding":"4.1.137","matchCriteriaId":"C2D95C1D-B022-435F-B4C7-33FC460064EA"},{"vulnerable":true,"criteria":"cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2.0","versionEndExcluding":"4.2.17","matchCriteriaId":"80E3B839-CD5C-45D0-81C0-CABCE7A5D9AF"}]}]}],"references":[{"url":"https://github.com/netty/netty/pull/17213","source":"security-advisories@github.com","tags":["Issue Tracking","Patch"]},{"url":"https://github.com/netty/netty/pull/17217","source":"security-advisories@github.com","tags":["Issue Tracking","Patch"]},{"url":"https://github.com/netty/netty/releases/tag/netty-4.1.137.Final","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/netty/netty/releases/tag/netty-4.2.17.Final","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/netty/netty/security/advisories/GHSA-8c42-7qj2-3j46","source":"security-advisories@github.com","tags":["Vendor Advisory"]}]}}