{"id":"CVE-2021-32715","state":"PUBLISHED","title":"Lenient Parsing of Content-Length Header When Prefixed with Plus Sign","description":"hyper is an HTTP library for rust. hyper's HTTP/1 server code had a flaw that incorrectly parses and accepts requests with a `Content-Length` header with a prefixed plus sign, when it should have been rejected as illegal. This combined with an upstream HTTP proxy that doesn't parse such `Content-Length` headers, but forwards them, can result in \"request smuggling\" or \"desync attacks\". The flaw exists in all prior versions of hyper prior to 0.14.10, if built with `rustc` v1.5.0 or newer. The vulnerability is patched in hyper version 0.14.10. Two workarounds exist: One may reject requests manually that contain a plus sign prefix in the `Content-Length` header or ensure any upstream proxy handles `Content-Length` headers with a plus sign prefix.","publishedAt":"2021-07-07T20:05:11.000Z","updatedAt":"2024-08-03T23:25:31.081Z","severity":{"score":3.1,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["hyperium hyper"],"affected":[{"vendor":"hyperium","product":"hyper","versions":[{"version":"< 0.14.10","status":"affected"}]}],"references":["https://github.com/hyperium/hyper/security/advisories/GHSA-f3pg-qwvg-p99c","https://github.com/rust-lang/rust/pull/28826/commits/123a83326fb95366e94a3be1a74775df4db97739"],"weaknesses":["CWE-444"],"ingestedAt":"2026-10-29T19:48:33.225Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/32xxx/CVE-2021-32715.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-32715","state":"PUBLISHED","datePublished":"2021-07-07T20:05:11.000Z","dateUpdated":"2024-08-03T23:25:31.081Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2021-05-12T00:00:00.000Z"},"containers":{"cna":{"title":"Lenient Parsing of Content-Length Header When Prefixed with Plus Sign","descriptions":[{"lang":"en","value":"hyper is an HTTP library for rust. hyper's HTTP/1 server code had a flaw that incorrectly parses and accepts requests with a `Content-Length` header with a prefixed plus sign, when it should have been rejected as illegal. 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