libmojolicious-perl: Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BRE...
CVE-2026-15747 is fixed in 3 products on 1 platform, first by FEDORA-2026-6F12B08313, released July 19, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libmojolicious-perl · Debian 14 | 9.48+dfsg-1 | DEBIAN-CVE-2026-15747 | Jul 31, 2026 |
| perl-Mojolicious · Fedora 43 | 9.48-1.fc43 | FEDORA-2026-6F12B08313 | Jul 19, 2026 |
| perl-Mojolicious · amzn 2023 | 9.48-2.amzn2023.0.1 | ALAS2023-2026-3209 | Nov 7, 2026 |
| perl-Mojolicious · opensuse-leap 16.0 | 9.480.0-bp160.1.1 | OPENSUSE-SU-2026:21496-1 | Jul 29, 2026 |
| perl-Mojolicious · sles 15.7 | 9.370.0-150700.3.3.1 | SUSE-SU-2026:4151-1 | Sep 14, 2026 |
| perl-Test-Mojo · Fedora 43 | 9.48-1.fc43 | FEDORA-2026-6F12B08313 | Jul 19, 2026 |
| perl-Test-Mojo · amzn 2023 | 9.48-2.amzn2023.0.1 | ALAS2023-2026-3209 | Nov 7, 2026 |
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