CVE-2023-4236

Summary

CVE-2023-4236 is a vulnerability affecting the BIND 9 DNS server, specifically versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1. This issue arises from a flaw in the server's handling of DNS-over-TLS queries. Under heavy query loads, `named` may experience an assertion failure and terminate unexpectedly. The root cause stems from incorrect reuse of internal data structures during DNS-over-TLS query processing. This vulnerability could potentially lead to denial-of-service conditions for DNS services relying on the affected BIND 9 versions.

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