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c-ares version 1.34.8 - July 7 2026

This is a bugfix release.

Bugfixes:

  • Revert "Mark parameters in callbacks as const" which shipped in 1.34.7. Changing the parameter types of the ares_callback, ares_host_callback, and ares_nameinfo_callback function pointer typedefs was an unintended API break: existing applications with the historical non-const callback signatures no longer compiled, particularly in C++ where function pointer types must match exactly. The read-only nature of the callback parameters is now documented instead. PR #1244

Thanks go to these friendly people for their efforts and contributions for this release:

  • Brad House (@bradh352)

c-ares version 1.34.7 - July 6 2026

This is a security release.

Security:

Changes:

  • ares_getaddrinfo(): handle a NULL node per POSIX and implement ARES_AI_PASSIVE. PR #1186
  • Mark parameters in callbacks as const. PR #1060
  • Correct ARES_CLASS_HESOID misspelling to ARES_CLASS_HESIOD. PR #1092

Bugfixes:

  • Fix sticky server recovery when all servers have failures. PR #1192
  • Fix UDP socket exhaustion regression: retire connections per-connection, not via server failure count. PR #1197
  • Guard DNS record binary length overflow. PR #1168
  • Prevent integer overflow in allocation size calculations. PR #1147
  • Prevent overflow in ares_array allocation size calculations. PR #1117
  • Prevent integer overflow in buffer size calculation. PR #1116
  • Add overflow checks to ares_buf_ensure_space(). PR #1094
  • Skip name compression offsets beyond the 14-bit pointer limit. PR #1159
  • ares_dns_parse: reject name compression in RDATA where not permitted (RFC 3597). PR #1190
  • ares_dns_parse: reject responses with more than one OPT record (RFC 6891). PR #1189
  • Discard oversized UDP datagrams instead of truncating the length frame. PR #1161
  • Route numeric config parsing through range-checked ares_str_parse_uint. PR #1158
  • Replace atoi-based port parsing with validated helper. PR #1097
  • Defer TCP connection error handling until DNS responses are parsed. PR #1138
  • Prevent undefined-behavior left shift in ares_calc_query_timeout(). PR #1151
  • Use unsigned type for ares_round_up_pow2_u64 to avoid undefined behavior. PR #1107
  • Fix undefined behavior in ares_buf_replace() pointer arithmetic. PR #1099
  • ares_array: reset offset when array becomes empty. PR #1165
  • ares_iface_ips: add ARES_IFACE_IP_NONE zero enum value. PR #1187
  • ares_sysconfig_files: recognize AIX netsvc.conf bind4/local4 tokens. PR #1188
  • Use safe string construction in Windows sysconfig join path. PR #1143
  • Fix zero-length RAW_RR losing type metadata during parsing. PR #1129
  • Fix RAW_RR type tostr/fromstr roundtrip mismatch. PR #1123
  • Fix NULL dereference for ifa netmask. PR #1120
  • adig: fix negated option prefix parsing. PR #1135
  • Use UnregisterWaitEx to prevent use-after-free on Win32. PR #1111
  • Add NULL check after ares_malloc_zero in Windows UTF8 conversion. PR #1121
  • Fix NULL dereference after ares_malloc_zero in Win32 IOCP event add. PR #1132
  • Fix microsecond overflow in ares_queue_wait_empty timeout. PR #1122
  • Fix NULL dereference in ares_buf_replace() on NULL buf. PR #1124
  • Initialize *read_bytes in ares_socket_recvfrom(). PR #1125
  • Fix memory leak of binbuf in ares_buf_parse_dns_binstr_int. PR #1126
  • Fix memory leak of qcache entry on key allocation failure. PR #1127
  • Fix memory leak of buf in ares_dns_multistring_combined() on OOM. PR #1110
  • Fix memory leaks on error paths in two functions. PR #1109
  • Fix memory leak of buckets in ares_htable_dict_keys() error path. PR #1108
  • Fix memory leak of bucket->key in ares_htable_dict_insert error path. PR #1105
  • Fix additional memory leaks. PR #1091 PR #1078
  • Prevent corrupt addrinfo nodes on sockaddr allocation failure. PR #1112
  • Fix two logic bugs in DNS cookie handling. PR #1103
  • Fix linked list INSERT_BEFORE corruption and array insertdata_first ordering. PR #1101
  • Fix HASH_IDX macro missing parentheses. PR #1128
  • Fix malloc(0) in ares_htable_all_buckets on empty table. PR #1131
  • Fix wrong sizeof in QNX confstr() call truncating domain names. PR #1130
  • Clear probe pending flag after timeout. PR #1059
  • Fix incorrect check for empty wide string. PR #1064
  • Handle strdup failure. PR #1077
  • doc: reference ares_free_string(), not ares_free(). PR #1084

Thanks go to these friendly people for their efforts and contributions for this release:

  • (@Alb3e3)
  • Brad House (@bradh352)
  • (@dankmeme01)
  • David Hotham (@dimbleby)
  • Tom Flynn (@Flynnzaa)
  • (@jmestwa-coder)
  • (@kodareef5)
  • Kaixuan Li (@MarkLee131)
  • (@lifenjoiner)
  • (@metsw24-max)
  • Song Li (@SongTonyLi)
  • (@uwezkhan)

c-ares version 1.34.6 - December 8 2025

This is a security release.

Security:

Changes:

  • Ignore Windows IDN Search Domains until proper IDN support is added. PR #1034

Bugfixes:

  • Event Thread could stall when not notified of new queries on existing connections that are in a bad state PR #1032
  • fix conversion of invalid service to port number in ares_getaddrinfo() PR #1029
  • fix memory leak in ares_uri PR #1012
  • Ignore ares_event_configchg_init failures PR #1009
  • Use XOR for random seed generation on fallback logic. PR #994
  • Fix clang build on windows. PR #996
  • Fix IPv6 link-local nameservers in /etc/resolv.conf PR #996
  • Fix a few build issues on MidnightBSD. PR #983

Thanks go to these friendly people for their efforts and contributions for this release:

  • Brad House (@bradh352)
  • (@F3lixTheCat)
  • Lucas Holt (@laffer1)
  • @oargon
  • Pavel P (@pps83)
  • Sean Harmer (@seanharmer)
  • Uwe (@nixblik)