{"id":"DEBIAN-CVE-2026-15747","details":"Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle.  _csrf_token generates and caches one token per session and returns the same value on every call, and _csrf_field places that value in a hidden `csrf_token` input. When a response carrying the token also echoes attacker-controlled input and is gzip-compressed, the chosen values and the resulting compressed lengths form a BREACH oracle.  An attacker able to query it can recover the token and pass csrf_protect validation.","modified":"2026-09-14T17:02:47.521833058Z","published":"2026-07-14T18:17:12.587Z","upstream":["CVE-2026-15747"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-15747"}],"affected":[{"package":{"name":"libmojolicious-perl","ecosystem":"Debian:12","purl":"pkg:deb/debian/libmojolicious-perl?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.31+dfsg-1","9.33+dfsg-1","9.34+dfsg-1","9.35+dfsg-1","9.36+dfsg-1","9.36+dfsg-1~bpo12+2","9.37+dfsg-1","9.37+dfsg-2","9.37+dfsg-2~bpo12+1","9.38+dfsg-1","9.39+dfsg-1","9.42+dfsg-1","9.42+dfsg-1~bpo13+2","9.45+dfsg-1","9.45+dfsg-2","9.46+dfsg-1","9.47+dfsg-1","9.48+dfsg-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-15747.json"}},{"package":{"name":"libmojolicious-perl","ecosystem":"Debian:13","purl":"pkg:deb/debian/libmojolicious-perl?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.39+dfsg-1","9.42+dfsg-1","9.42+dfsg-1~bpo13+2","9.45+dfsg-1","9.45+dfsg-2","9.46+dfsg-1","9.47+dfsg-1","9.48+dfsg-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-15747.json"}},{"package":{"name":"libmojolicious-perl","ecosystem":"Debian:14","purl":"pkg:deb/debian/libmojolicious-perl?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.48+dfsg-1"}]}],"versions":["9.39+dfsg-1","9.42+dfsg-1","9.42+dfsg-1~bpo13+2","9.45+dfsg-1","9.45+dfsg-2","9.46+dfsg-1","9.47+dfsg-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-15747.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"}]}