{"id":"JLSEC-2026-1381","details":"Mongoose is an embedded web server and network library. Priro to version 7.22, a remote unauthenticated attacker can send an HTTP request containing both Content-Length and Transfer-Encoding: chunked. The `cl_count` and `te_count` checks in the `mg_http_parse()` and `http_cb()` paths in `src/http.c` accept both headers and prioritize chunked encoding, while a Content-Length-preferring reverse proxy can use a different request boundary. This CL.TE desynchronization can inject requests that access or modify resources in another user context. This issue is fixed in version 7.22.","modified":"2026-08-24T14:00:03.395164049Z","published":"2026-08-24T13:43:17.899Z","upstream":["CVE-2026-73257","EUVD-2026-63492"],"database_specific":{"sources":[{"id":"CVE-2026-73257","imported":"2026-08-23T06:20:30.552Z","modified":"2026-08-20T20:17:46.470Z","published":"2026-08-20T18:16:46.973Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-73257","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73257","database_specific":{"status":"Received"}},{"modified":"2026-08-20T19:34:58Z","published":"2026-08-20T17:30:58Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-63492","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-63492","affected":{"Cesanta:Mongoose":["\u003c 7.22"]},"id":"EUVD-2026-63492","imported":"2026-08-23T06:20:06.544Z"}],"license":"CC-BY-4.0"},"references":[{"type":"WEB","url":"https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71"},{"type":"WEB","url":"https://github.com/cesanta/mongoose/pull/3611"},{"type":"WEB","url":"https://github.com/cesanta/mongoose/releases/tag/7.22"},{"type":"WEB","url":"https://github.com/cesanta/mongoose/security/advisories/GHSA-5wfq-r6mr-wqp6"}],"affected":[{"package":{"name":"Mongoose_jll","ecosystem":"Julia","purl":"pkg:julia/Mongoose_jll?uuid=0a8a3f5b-4c0e-5906-8e29-5b3fee15539c"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1381.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","source":"CNA"}]}