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Ubuntu 25.04 USN-7534-1 critical: Flask session signing with outdated keys

Flask could be made to sign sessions with stale keys.. ========================================================================== Ubuntu Security Notice USN-7534-1 May 26, 2025 flask vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.04 Summary: Flask could be made to sign sessions with stale keys. Software Description: - flask: Micro web framework based on Werkzeug and Jinja2 Details: It was discovered that Flask incorrectly handled key rotation. An attacker could possibly use this issue to sign sessions with stale keys. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 25.04 python3-flask 3.1.0-2ubuntu1.1 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-7534-1 CVE-2025-47278 Package Information: https://launchpad.net/ubuntu/+source/flask/3.1.0-2ubuntu1.1 . Keep updated with Ubuntu Security Notice USN-7534-2 concerning Flask session signing using deprecated keys.. Flask Security, Ubuntu Security Notice, Session Signing, Key Rotation, Software Vulnerabilities. . Severity: Critical. LinuxSecurity.com Team

May 26, 2025 •Critical Ubuntu