{"id":"DEBIAN-CVE-2026-52747","details":"ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Prior to 3.0.16, the multipart/form-data request body parser in libmodsecurity silently removes embedded line breaks from non-file form-field values before exporting them to ARGS and ARGS_POST because src/request_body_processor/multipart.cc overwrites reserved bytes in m_reserve instead of appending the current buffer. This creates a parser differential between ModSecurity and backend applications that preserve line breaks in form fields, allowing rules that inspect ARGS or ARGS_POST to miss payloads whose dangerous syntax depends on a line break. This issue is fixed in version 3.0.16.","modified":"2026-09-14T17:03:43.025447792Z","published":"2026-07-10T22:16:42.697Z","upstream":["CVE-2026-52747"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-52747"}],"affected":[{"package":{"name":"modsecurity","ecosystem":"Debian:12","purl":"pkg:deb/debian/modsecurity?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.10-1","3.0.11-1","3.0.12-1","3.0.12-1.1","3.0.12-1.1~exp1","3.0.13-1","3.0.14-1","3.0.15-1","3.0.16-1","3.0.9-1","3.0.9-1+deb12u1","3.0.9-1+deb12u2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-52747.json"}},{"package":{"name":"modsecurity","ecosystem":"Debian:13","purl":"pkg:deb/debian/modsecurity?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.14-1","3.0.14-1+deb13u1","3.0.15-1","3.0.16-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-52747.json"}},{"package":{"name":"modsecurity","ecosystem":"Debian:14","purl":"pkg:deb/debian/modsecurity?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.16-1"}]}],"versions":["3.0.14-1","3.0.15-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-52747.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N"}]}