CVE-2026-19667 Remote assertion failure via 16-bit length truncation in `dns_ncache_add()`

If an attacker-controlled authoritative server can produce a negative answer that is exactly 65536 bytes, then a flaw in named results in a negative cache entry of 0 bytes. When this entry is subsequently read, named aborts. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 throug...

CVE-2026-19667

CVE-2026-19667 is a remote assertion failure in the BIND 9 named daemon, caused by a 16-bit length truncation in dns_ncache_add(). When an attacker-controlled authoritative server returns a negative answer of exactly 65536 bytes , the negative cache entry is stored as 0 bytes; reading that entry ...