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This security release fixes the Rebirthday Attack CVE-2025-5994. This re-opens up resolvers to a birthday paradox, for EDNS client subnet servers that respond with non-ECS answers. It only affects Unbound when compiled with --enable-subnet, and subnetmod is enabled with config options that send ECS information to upstream servers. The CVE is described here https://nlnetlabs.nl/downloads/unbound/CVE-2025-5994.txt See: https://github.com/NLnetLabs/unbound/releases/tag/release-1.23.1 Signed-off-by: Kyle Harding <kyle@balena.io>