{"id":"CVE-2026-59903","state":"PUBLISHED","title":"Netty: Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite","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.","publishedAt":"2026-08-17T17:56:28.726Z","updatedAt":"2026-08-17T18:14:01.121Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["netty netty"],"affected":[{"vendor":"netty","product":"netty","versions":[{"version":"< 4.1.137.Final","status":"affected"},{"version":">= 4.2.0.Final, < 4.2.17.Final","status":"affected"}]}],"references":["https://github.com/netty/netty/security/advisories/GHSA-8c42-7qj2-3j46","https://github.com/netty/netty/pull/17213","https://github.com/netty/netty/pull/17217","https://github.com/netty/netty/releases/tag/netty-4.1.137.Final","https://github.com/netty/netty/releases/tag/netty-4.2.17.Final"],"weaknesses":["CWE-524"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/59xxx/CVE-2026-59903.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-59903","state":"PUBLISHED","datePublished":"2026-08-17T17:56:28.726Z","dateUpdated":"2026-08-17T18:14:01.121Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-07T16:40:07.984Z"},"containers":{"cna":{"title":"Netty: Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite","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":[{"vendor":"netty","product":"netty","versions":[{"version":"< 4.1.137.Final","status":"affected"},{"version":">= 4.2.0.Final, < 4.2.17.Final","status":"affected"}]}],"references":[{"url":"https://github.com/netty/netty/security/advisories/GHSA-8c42-7qj2-3j46","name":"https://github.com/netty/netty/security/advisories/GHSA-8c42-7qj2-3j46","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/netty/netty/pull/17213","name":"https://github.com/netty/netty/pull/17213","tags":["x_refsource_MISC"]},{"url":"https://github.com/netty/netty/pull/17217","name":"https://github.com/netty/netty/pull/17217","tags":["x_refsource_MISC"]},{"url":"https://github.com/netty/netty/releases/tag/netty-4.1.137.Final","name":"https://github.com/netty/netty/releases/tag/netty-4.1.137.Final","tags":["x_refsource_MISC"]},{"url":"https://github.com/netty/netty/releases/tag/netty-4.2.17.Final","name":"https://github.com/netty/netty/releases/tag/netty-4.2.17.Final","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-524","lang":"en","description":"CWE-524: Use of Cache Containing Sensitive Information","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-17T17:56:28.726Z"},"source":{"advisory":"GHSA-8c42-7qj2-3j46","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-17T18:13:26.781284Z","id":"CVE-2026-59903","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-17T18:14:01.121Z"}}]}}}