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Multiple OPT records accepted in a single DNS response (RFC 6891 violation)

Status: Open.

#1137 In c-ares/c-ares;

· AsafMeizner opened on Apr 10, 2026

HTTPS first causes early resends of A+AAAA queries

Status: Open.

#1115 In c-ares/c-ares;

· icing opened on Apr 2, 2026

DNS resolution fails with EDNS cookie mismatch on forwarded queries

Status: Open.

#1081 In c-ares/c-ares;

· marcosrmendezthd opened on Feb 9, 2026

/etc/hosts processing mixing entries

Status: Open.

#1049 In c-ares/c-ares;

· juanpeha opened on Dec 2, 2025

Improve error messages for DNS cookie issues

Status: Open.

#1044 In c-ares/c-ares;

· jimparis opened on Nov 10, 2025

A crafted resolver configuration drives c-ares into unbounded mutual recursion between ares_requeue_query() and ares_send_query(), ultimately causing a stack overflow (ASan: stack-overflow).

Status: Open.

#1043 In c-ares/c-ares;

· weijinjinnihao opened on Nov 5, 2025

NULL Pointer Dereference in ares_getaddrinfo when name parameter is NULL

Status: Open.

#1035 In c-ares/c-ares;

· LkkkLxy opened on Sep 22, 2025

c-ares fails to load DNS servers for users with broken GetAdaptersAddresses

Status: Open.

#1020 In c-ares/c-ares;

· MichalPetryka opened on Aug 16, 2025

Option to not rewrite cookie for ares_send_dnsrec

Status: Open.

#1019 In c-ares/c-ares;

· 5533asdg opened on Aug 12, 2025

c-ares fails to resolve with non compliant DNS servers while OS works

Status: Open.

#1017 In c-ares/c-ares;

· MichalPetryka opened on Aug 9, 2025

snprintf not available with c90 and strict ansi

Status: Open.

#1001 In c-ares/c-ares;

· patriklantto opened on Jul 3, 2025

question about TLSA query

Status: Open.

#998 In c-ares/c-ares;

· theanarkh opened on Jun 5, 2025