Unbound 1.23.1 released

We are pleased to announce the release of version 1.23.1 of the Unbound recursive DNS resolver. This security release fixes CVE-2025-5994. A multi-vendor cache poisoning vulnerability named "Rebirthday Attack" has been discovered in caching resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with …

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On 07/16/2025, 07:00 AM, NLnet Labs published "Unbound 1.23.1 released" (type: Release). Related technologies: Unbound. CVE: CVE-2025-5994.