{"id":"CVE-2026-73812","state":"PUBLISHED","title":"inets, httpd: HTTP Request Smuggling via Transfer-Encoding and Content-Length","description":"httpd function check_header/3 rejects duplicate Content-Length (per CVE-2026-23941) but never checks for the TE+CL co-presence that RFC 9112 §6.3 identifies as a probable smuggling attempt. handle_body/3 frames by chunked and silently discards Content-Length. A CL-preferring front-end paired with chunked-preferring inets creates a classic CL.TE front-end/back-end desync.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.","publishedAt":"2026-09-01T14:42:42.374Z","updatedAt":"2026-09-08T01:10:14.000Z","severity":{"score":8.3,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N","source":"EEF"},"assigner":"EEF","products":["Erlang OTP"],"affected":[{"vendor":"Erlang","product":"OTP","packageName":"otp","packageURL":"pkg:software-id/erlang.org/otp","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"17.0","versionType":"otp"},{"version":"17.0","status":"affected","lessThan":"27.3.4.17","versionType":"otp"},{"version":"28.0","status":"affected","lessThan":"28.5.0.6","versionType":"otp"},{"version":"29.0","status":"affected","lessThan":"29.0.6","versionType":"otp"}],"cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"]},{"vendor":"Erlang","product":"OTP","packageName":"inets","packageURL":"pkg:otp/inets","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"5.10","versionType":"otp"},{"version":"5.10","status":"affected","lessThan":"9.3.2.7","versionType":"otp"},{"version":"9.4","status":"affected","lessThan":"9.6.2.3","versionType":"otp"},{"version":"9.7","status":"affected","lessThan":"9.7.2","versionType":"otp"}],"cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"repo":"https://github.com/erlang/otp"},{"vendor":"Erlang","product":"OTP","packageName":"erlang/otp","packageURL":"pkg:github/erlang/otp","defaultStatus":"unaffected","versions":[{"version":"84adefa331c4159d432d22840663c38f155cd4c1","status":"affected","lessThan":"591dc00dc99dc2a426167a3b5257c0c94bd45e91","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"repo":"https://github.com/erlang/otp"}],"references":["https://github.com/erlang/otp/security/advisories/GHSA-7j6m-4ffg-hg46","https://cna.erlef.org/cves/CVE-2026-73812.html","https://osv.dev/vulnerability/EEF-CVE-2026-73812","https://github.com/erlang/otp/commit/591dc00dc99dc2a426167a3b5257c0c94bd45e91"],"weaknesses":["CWE-444"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/73xxx/CVE-2026-73812.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73812","state":"PUBLISHED","datePublished":"2026-09-01T14:42:42.374Z","dateUpdated":"2026-09-08T01:10:14.000Z","assignerShortName":"EEF","assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateReserved":"2026-08-17T11:00:01.498Z"},"containers":{"cna":{"title":"inets, httpd: HTTP Request Smuggling via Transfer-Encoding and Content-Length","descriptions":[{"lang":"en","value":"httpd function check_header/3 rejects duplicate Content-Length (per CVE-2026-23941) but never checks for the TE+CL co-presence that RFC 9112 §6.3 identifies as a probable smuggling attempt. handle_body/3 frames by chunked and silently discards Content-Length. A CL-preferring front-end paired with chunked-preferring inets creates a classic CL.TE front-end/back-end desync.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown."}],"affected":[{"vendor":"Erlang","product":"OTP","packageName":"otp","packageURL":"pkg:software-id/erlang.org/otp","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"17.0","versionType":"otp"},{"version":"17.0","status":"affected","lessThan":"27.3.4.17","versionType":"otp"},{"version":"28.0","status":"affected","lessThan":"28.5.0.6","versionType":"otp"},{"version":"29.0","status":"affected","lessThan":"29.0.6","versionType":"otp"}],"cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"]},{"vendor":"Erlang","product":"OTP","packageName":"inets","packageURL":"pkg:otp/inets","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"5.10","versionType":"otp"},{"version":"5.10","status":"affected","lessThan":"9.3.2.7","versionType":"otp"},{"version":"9.4","status":"affected","lessThan":"9.6.2.3","versionType":"otp"},{"version":"9.7","status":"affected","lessThan":"9.7.2","versionType":"otp"}],"cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"repo":"https://github.com/erlang/otp"},{"vendor":"Erlang","product":"OTP","packageName":"erlang/otp","packageURL":"pkg:github/erlang/otp","defaultStatus":"unaffected","versions":[{"version":"84adefa331c4159d432d22840663c38f155cd4c1","status":"affected","lessThan":"591dc00dc99dc2a426167a3b5257c0c94bd45e91","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"repo":"https://github.com/erlang/otp"}],"references":[{"url":"https://github.com/erlang/otp/security/advisories/GHSA-7j6m-4ffg-hg46","tags":["vendor-advisory"]},{"url":"https://cna.erlef.org/cves/CVE-2026-73812.html","tags":["related"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-73812","tags":["related"]},{"url":"https://github.com/erlang/otp/commit/591dc00dc99dc2a426167a3b5257c0c94bd45e91","tags":["patch"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.3,"baseSeverity":"HIGH","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"HIGH","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-444","description":"CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"EEF","orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateUpdated":"2026-09-08T01:10:14.000Z"},"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*","versionEndExcluding":"27.3.4.17","vulnerable":true},{"criteria":"cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*","versionEndExcluding":"28.5.0.6","versionStartIncluding":"28.0","vulnerable":true},{"criteria":"cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*","versionEndExcluding":"29.0.6","versionStartIncluding":"29.0","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"AND"}],"credits":[{"lang":"en","type":"remediation developer","value":"Konrad Pietrzak / Ericsson"},{"lang":"en","type":"finder","value":"Lukas Backström / Erlang Solutions"}],"impacts":[{"capecId":"CAPEC-33","descriptions":[{"lang":"en","value":"CAPEC-33 HTTP Request Smuggling"}]}],"source":{"discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-01T15:56:32.935740Z","id":"CVE-2026-73812","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":"2026-09-01T15:56:45.383Z"}}]}}}