{"id":"CVE-2026-23527","state":"PUBLISHED","title":"h3 v1 has Request Smuggling (TE.TE) issue","description":"H3 is a minimal H(TTP) framework built for high performance and portability. Prior to 1.15.5, there is a critical HTTP Request Smuggling vulnerability. readRawBody is doing a strict case-sensitive check for the Transfer-Encoding header. It explicitly looks for \"chunked\", but per the RFC, this header should be case-insensitive. This vulnerability is fixed in 1.15.5.","publishedAt":"2026-01-15T19:24:20.514Z","updatedAt":"2026-04-13T16:48:19.873Z","severity":{"score":8.9,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["h3js h3"],"affected":[{"vendor":"h3js","product":"h3","versions":[{"version":"< 1.15.5","status":"affected"}]}],"references":["https://github.com/h3js/h3/security/advisories/GHSA-mp2g-9vg9-f4cg","https://github.com/h3js/h3/commit/618ccf4f37b8b6148bea7f36040471af45bfb097","https://github.com/h3js/h3/releases/tag/v1.15.5","https://simonkoeck.com/writeups/h3-transfer-encoding-request-smuggling"],"weaknesses":["CWE-444"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23527.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23527","state":"PUBLISHED","datePublished":"2026-01-15T19:24:20.514Z","dateUpdated":"2026-04-13T16:48:19.873Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-01-13T18:22:43.981Z"},"containers":{"cna":{"title":"h3 v1 has Request Smuggling (TE.TE) issue","descriptions":[{"lang":"en","value":"H3 is a minimal H(TTP) framework built for high performance and portability. Prior to 1.15.5, there is a critical HTTP Request Smuggling vulnerability. readRawBody is doing a strict case-sensitive check for the Transfer-Encoding header. It explicitly looks for \"chunked\", but per the RFC, this header should be case-insensitive. This vulnerability is fixed in 1.15.5."}],"affected":[{"vendor":"h3js","product":"h3","versions":[{"version":"< 1.15.5","status":"affected"}]}],"references":[{"url":"https://github.com/h3js/h3/security/advisories/GHSA-mp2g-9vg9-f4cg","name":"https://github.com/h3js/h3/security/advisories/GHSA-mp2g-9vg9-f4cg","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/h3js/h3/commit/618ccf4f37b8b6148bea7f36040471af45bfb097","name":"https://github.com/h3js/h3/commit/618ccf4f37b8b6148bea7f36040471af45bfb097","tags":["x_refsource_MISC"]},{"url":"https://github.com/h3js/h3/releases/tag/v1.15.5","name":"https://github.com/h3js/h3/releases/tag/v1.15.5","tags":["x_refsource_MISC"]},{"url":"https://simonkoeck.com/writeups/h3-transfer-encoding-request-smuggling","name":"https://simonkoeck.com/writeups/h3-transfer-encoding-request-smuggling","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":8.9,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-444","lang":"en","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-13T16:48:19.873Z"},"source":{"advisory":"GHSA-mp2g-9vg9-f4cg","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-01-15T19:59:57.020909Z","id":"CVE-2026-23527","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-15T20:00:06.302Z"}}]}}}