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Fixes CVEs: - CVE-2023-50387: Validating DNS messages containing a lot of DNSSEC signatures could cause excessive CPU load, leading to a denial-of-service condition. - CVE-2023-50868: Preparing an NSEC3 closest encloser proof could cause excessive CPU load, leading to a denial-of-service condition. - CVE-2023-4408: Parsing DNS messages with many different names could cause excessive CPU load. - CVE-2023-5517: Specific queries could cause named to crash with an assertion failure when nxdomain-redirect was enabled. - CVE-2023-5679: A bad interaction between DNS64 and serve-stale could cause named to crash with an assertion failure, when both of these features were enabled. Signed-off-by: Noah Meyerhans <[email protected]>
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