The latest update to GNU Screen 5.0.1 addresses multiple high-severity security vulnerabilities, reinforcing its position as a mission-critical terminal multiplexer for Linux administrators and developers.
This release, announced via the official GNU mailing list, includes patches for exploitable flaws and optimizations for enterprise environments.
Key Security Fixes in GNU Screen 5.0.1
The SUSE Security Team recently disclosed critical vulnerabilities in GNU Screen, prompting this urgent update. Below are the most significant patches:
CVE-2025-46805: Prevents privilege escalation by restricting root-level signal handling.
CVE-2025-46804: Mitigates information leaks from file existence tests.
CVE-2025-46803: Enforces secure PTY default permissions (0620) to block unauthorized access.
CVE-2025-46802: Eliminates temporary 0666 PTY mode, a major security risk in attached sessions.
CVE-2025-23395: Reintroduces lf_secreopen() for secure logfile handling.
Additional fixes include:
✔ Buffer overflow from improper strncpy() usage
✔ Uninitialized variables causing undefined behavior
✔ Typographical errors in legacy code
✔ Combining character handling flaws leading to segmentation faults
Why This Update Matters for Enterprises & Developers
GNU Screen remains a cornerstone of Linux terminal management, especially for remote server administration, DevOps workflows, and multi-session development. The resolved vulnerabilities could have allowed:
Privilege escalation attacks
Data leaks via side channels
Session hijacking through PTY manipulation
For system administrators, upgrading to 5.0.1 is non-negotiable—especially in regulated industries (finance, healthcare, cloud hosting) where compliance (ISO 27001, SOC 2) demands rigorous patch management.
Download & Upgrade Instructions
The official GNU Screen 5.0.1 release is available via:
Linux distribution repositories (Check
apt/yum/dnfupdates)
Pro Tip: Pair this update with SELinux/AppArmor policies for defense-in-depth protection.
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