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Threats Tagged 'cve-2026-15747'

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Active filters (1):Tag: cve-2026-15747

Threats Tagged 'cve-2026-15747'

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A security update for perl-Mojolicious addresses a vulnerability (CVE-2026-15747) where CSRF tokens were susceptible to BREACH attacks due to token reuse across a session. The update changes token handling to mask tokens with a fresh random value on every request. Additional fixes include limiting JSON decoding depth to prevent memory exhaustion and various improvements and bug fixes in the Mojolicious framework.

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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.

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