Linuxsecurity Fedora OpenSSH Vulnerabilities Lead to Client-Side DoS Risks
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- •Three critical vulnerabilities in OpenSSH affect Fedora 43 and 44.
- •CVE-2026-55653 can lead to client-side denial of service.
- •Patches were released on July 7, 2026, and users are urged to update.
Recent updates to Fedora's OpenSSH have addressed critical vulnerabilities identified as CVE-2026-55653, CVE-2026-55654, and CVE-2026-55655. These vulnerabilities include a double free error in the DH-GEX client path, a heap out-of-bounds read during GSSAPI cleanup, and a potential MITM attack via X11 forwarding. The flaws can lead to client-side denial of service and compromise the security of X11 sessions. Affected systems include Fedora versions 43 and 44. The vulnerabilities were published on June 23, 2026, and patches were released on July 7, 2026. Users are advised to update their systems using the 'dnf' package manager to mitigate these risks. The issues were reported by developers Zoltan Fridrich and Dmitry Belyavskiy.
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