Critical DoS Vulnerability in Valkey Affects Fedora 42 and 43

Critical DoS Vulnerability in Valkey Affects Fedora 42 and 43

First seen 5 Mar 2026, 08:11 UTC •Linuxsecurity •98% similarity •66.8

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A critical Denial of Service (DoS) vulnerability has been identified in Valkey versions 8.0.7 and 8.1.6, affecting Fedora 42 and 43. The vulnerability could allow attackers to exploit the in-memory dataset architecture of Valkey, potentially leading to service disruptions. CVE-2026-21863 was published on February 23, 2026, highlighting the urgency for users to apply patches.

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Timeline

2026-02-23
CVE-2026-21863 published
2026-02-23
CVE-2025-67733 published
2026-02-24
First public PoC for CVE-2025-67733
2026-03-05
Fedora 42 Valkey 8.0.7 Critical DoS Threat Update released
2026-03-05
Fedora 43 Valkey 8.1.6 DoS Fix Advisory released

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