{"id":"CVE-2026-55614","state":"PUBLISHED","title":"uhttpd vulnerable to HTTP request smuggling via case-sensitive Transfer-Encoding matching","description":"uhttpd is a small HTTP server. In unpatched repository snapshots, `client_parse_header()` in `client.c` lowercases header names but compares the `Transfer-Encoding` value to `chunked` using case-sensitive `strcmp`. A mixed-case transfer-coding token is accepted without enabling `r->transfer_chunked`, despite transfer-coding tokens being case-insensitive. On a keep-alive connection, the `chunked` POST body is left unread and request-shaped body bytes are parsed as another HTTP request, permitting HTTP request smuggling and boundary desynchronization. Commits ae015e099986ceace44975cb69629841a2d58d37 and 6641b050e5f7c7fd9ae92e8e119d6d6dfc6e9837 patch the issue.","publishedAt":"2026-10-30T22:01:54.750Z","updatedAt":"2026-10-30T22:01:54.750Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["openwrt uhttpd"],"affected":[{"vendor":"openwrt","product":"uhttpd","versions":[{"version":">= 2bef561c890f275ce3b785e6abdb3eda28c96aa8, < ae015e099986ceace44975cb69629841a2d58d37","status":"affected"},{"version":">= 2bef561c890f275ce3b785e6abdb3eda28c96aa8, < 6641b050e5f7c7fd9ae92e8e119d6d6dfc6e9837","status":"affected"}]}],"references":["https://github.com/openwrt/uhttpd/security/advisories/GHSA-mcfg-c4r7-pjpf","https://github.com/openwrt/uhttpd/commit/6641b050e5f7c7fd9ae92e8e119d6d6dfc6e9837","https://github.com/openwrt/uhttpd/commit/ae015e099986ceace44975cb69629841a2d58d37"],"weaknesses":["CWE-444"],"ingestedAt":"2026-10-30T22:16:06.501Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55614.json","commit":"226652b7321cd45ef01add6f464a8114b52515e5","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55614","state":"PUBLISHED","datePublished":"2026-10-30T22:01:54.750Z","dateUpdated":"2026-10-30T22:01:54.750Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T23:31:22.445Z"},"containers":{"cna":{"title":"uhttpd vulnerable to HTTP request smuggling via case-sensitive Transfer-Encoding matching","descriptions":[{"lang":"en","value":"uhttpd is a small HTTP server. In unpatched repository snapshots, `client_parse_header()` in `client.c` lowercases header names but compares the `Transfer-Encoding` value to `chunked` using case-sensitive `strcmp`. A mixed-case transfer-coding token is accepted without enabling `r->transfer_chunked`, despite transfer-coding tokens being case-insensitive. On a keep-alive connection, the `chunked` POST body is left unread and request-shaped body bytes are parsed as another HTTP request, permitting HTTP request smuggling and boundary desynchronization. Commits ae015e099986ceace44975cb69629841a2d58d37 and 6641b050e5f7c7fd9ae92e8e119d6d6dfc6e9837 patch the issue."}],"affected":[{"vendor":"openwrt","product":"uhttpd","versions":[{"version":">= 2bef561c890f275ce3b785e6abdb3eda28c96aa8, < ae015e099986ceace44975cb69629841a2d58d37","status":"affected"},{"version":">= 2bef561c890f275ce3b785e6abdb3eda28c96aa8, < 6641b050e5f7c7fd9ae92e8e119d6d6dfc6e9837","status":"affected"}]}],"references":[{"url":"https://github.com/openwrt/uhttpd/security/advisories/GHSA-mcfg-c4r7-pjpf","name":"https://github.com/openwrt/uhttpd/security/advisories/GHSA-mcfg-c4r7-pjpf","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/openwrt/uhttpd/commit/6641b050e5f7c7fd9ae92e8e119d6d6dfc6e9837","name":"https://github.com/openwrt/uhttpd/commit/6641b050e5f7c7fd9ae92e8e119d6d6dfc6e9837","tags":["x_refsource_MISC"]},{"url":"https://github.com/openwrt/uhttpd/commit/ae015e099986ceace44975cb69629841a2d58d37","name":"https://github.com/openwrt/uhttpd/commit/ae015e099986ceace44975cb69629841a2d58d37","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"}}],"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":"2026-10-30T22:01:54.750Z"},"source":{"advisory":"GHSA-mcfg-c4r7-pjpf","discovery":"UNKNOWN"}}}}}