{"id":"CVE-2026-115473","title":"Mongoose: Heap OOB reads and null-byte bypass in mg_path_is_sane (util.c)","summary":"Mongoose is an embedded web server and network library. Prior to 7.22, mg_path_is_sane in src/util.c read path.buf[1] without first requiring path.len to be at least two and read s[2] when only two bytes remained. Unauthenticated remote …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","cvssSource":"cna","cwe":["CWE-125","CWE-158"],"vendor":"cesanta","product":"mongoose","affected":["mongoose < 7.22"],"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-11-05T20:02:05.668751Z"},"exploitAvailable":true,"published":"2026-11-04","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:02:27.603Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115473","references":[{"url":"https://github.com/cesanta/mongoose/security/advisories/GHSA-cjmx-764f-286c","label":"https://github.com/cesanta/mongoose/security/advisories/GHSA-cjmx-764f-286c"},{"url":"https://github.com/cesanta/mongoose/commit/b55de8b151d1466a3e41d1f854f22eeb6faa23dc","label":"https://github.com/cesanta/mongoose/commit/b55de8b151d1466a3e41d1f854f22eeb6faa23dc"},{"url":"https://github.com/cesanta/mongoose/releases/tag/7.22","label":"https://github.com/cesanta/mongoose/releases/tag/7.22"}],"tags":["cve.org","exploit-available"],"epss":0.00264,"epssPercentile":0.18311,"ingestedAt":"2026-11-05T22:38:31.692Z","slug":"CVE-2026-115473","body":"## Overview\n\nMongoose is an embedded web server and network library. Prior to 7.22, mg_path_is_sane in src/util.c read path.buf[1] without first requiring path.len to be at least two and read s[2] when only two bytes remained. Unauthenticated remote requests reaching mg_http_upload or mg_http_serve_dir with the affected short path shapes could therefore trigger one-byte heap out-of-bounds reads. On bare-metal or RTOS targets without memory protection, the adjacent byte could be exposed or influence whether a path was accepted, and instrumented builds could crash. This issue is fixed in version 7.22.\n\n## Affected\n\n- `mongoose < 7.22`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}