CVE-2026-15747 Affecting libmojolicious-perl package, versions *


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.25% (15th percentile)

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  • Snyk IDSNYK-DEBIAN12-LIBMOJOLICIOUSPERL-17973075
  • published15 Jul 2026
  • disclosed14 Jul 2026

Introduced: 14 Jul 2026

CVE-2026-15747  (opens in a new tab)

How to fix?

There is no fixed version for Debian:12 libmojolicious-perl.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libmojolicious-perl package and not the libmojolicious-perl package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1