SUSE-SU-2026:23364-1

Dashboard / Vulnerabilities / SUSE-SU-2026:23364-1

SUSE-SU-2026:23364-1

Summary: Security update for c-ares

Details: This update for c-ares fixes the following issues: Update to c-ares 1.34.8. - CVE-2025-31498: use-after-free in `read_answers()` when `process_answer()` may re-enqueue a query (bsc#1240955). - CVE-2025-62408: use-after-free due to connection being cleaned up after error (bsc#1254738). - CVE-2026-33630: remotely triggerable use-after-free/double-free in query-completion handling via `ares_getaddrinfo()` over TCP (bsc#1270416). - CVE-2026-69184: CPU exhaustion denial of service via unbounded DNS name compression pointer chains (bsc#1276290). - CVE-2026-69186: memory amplification denial of service via unvalidated DNS header record counts (bsc#1276291). Changes for c-ares: - c-ares 1.34.8: * For details, see https://c-ares.org/changelog.html. - c-ares 1.34.6: * Ignore Windows IDN Search Domains until proper IDN support is added. * Various bug fixes. - c-ares 1.34.4: * Changes: - QNX Port: Port to QNX 8, add primary config reading support, add CI build. PR #934, PR #937, PR #938 * Bugfixes: - Empty TXT records were not being preserved. PR #922 - `docs`: update deprecation notices for `ares_create_query()` and `ares_mkquery()`. PR #910 - `license`: some files weren't properly updated. PR #920 - Fix `bind` local device regression from 1.34.0. PR #929, PR #931, PR #935 - `CMake`: set policy version to prevent deprecation warnings. PR #932 - `CMake`: shared and static library names should be the same on unix platforms like `autotools` uses. PR #933 - Update to latest `autoconf` archive macros for enhanced system compatibility. PR #936 - c-ares 1.34.3: * Build the release package in an automated way so we can provide provenance as per SLSA3. PR #906 * Some upstream servers are non-compliant with EDNS options, resend queries without EDNS. Issue #911 * TSAN warns on missing lock, but lock isn't actually necessary. PR #915 * `ares_getaddrinfo(`) for `AF_UNSPEC` should retry IPv4 if only IPv6 is received. 765d558 * `ares_send()` shouldn't return `ARES_EBADRESP`, its `ARES_EBADQUERY`. 91519e7 * Fix typos in man pages. PR #905 - c-ares 1.34.2: * Features: - `adig`: read arguments from `adigrc`. [PR #856] - Add new pending write callback optimization via `ares_set_pending_write_cb`. [PR #857] - New function `ares_process_fds()`. [PR #875] - Failed servers should be probed rather than redirecting queries which could cause unexpected latency. [PR #877] - `adig`: rework command line arguments to mimic `dig` from `bind`. [PR #890] - Add new method for overriding network functions `ares_set_socket_function_ex()` to properly support all new functionality. [PR #894] - Fix regression with custom socket callbacks due to DNS cookie support. [PR #895] - `ares_socket`: set `IP_BIND_ADDRESS_NO_PORT` on `ares_set_local_ip*` tcp sockets [PR #887] - URI parser/writer for `ares_set_servers_csv()`/`ares_get_servers_csv()`. [PR #882] - Connection handling modularization. [PR #857], [PR #876] - Expose library/utility functions to tools. [PR #860] - Remove `ares__` prefix, just use `ares_` for internal functions. [PR #872] - fix: potential `WIN32_LEAN_AND_MEAN` redefinition. [PR #869] - Fix `googletest` v1.15 compatibility. [PR #874] - Fix `pkgconfig` thread dependencies. [PR #884] - c-ares 1.33.0: * Add DNS cookie support (RFC7873 + RFC9018) to help prevent off-path cache poisoning attacks. [PR #833] * Implement TCP FastOpen (TFO) RFC7413, which will make TCP reconnects 0-RTT on supported systems. [PR #840] * Reorganize source tree. [PR #822] * Refactoring of connection handling to prevent code duplication. [PR #839] * New dynamic array data structure to prevent simple logic flaws in array handling in various code paths. [PR #841] * `ares_destroy()` race condition during shutdown due to missing lock. [PR #831] - c-ares in 1.32: * Add support for DNS `0x20` to help prevent cache poisoning attacks, enabled by specifying `ARES_FLAG_DNS0x20`. Disabled by default. [PR #800] * Rework query timeout logic to automatically adjust timeouts based on network conditions. The timeout specified now is only used as a hint until there is enough history to calculate a more valid timeout. [PR #794] * DNS RR `TXT` strings should not be automatically concatenated as there are use cases outside of RFC 7208. In order to maintain ABI compliance, the ability to retrieve `TXT` strings concatenated is retained as well as a new API to retrieve the individual strings. This restores behavior from c-ares 1.20.0. [PR #801] * Clean up header inclusion logic to make hacking on code easier. [PR #797] * GCC/Clang: Enable even more strict warnings to catch more coding flaws. [253bdee] * Tests: Fix thread race condition in test cases for `EventThread`. [PR #803] * Thread Saftey: `ares_timeout()` was missing lock. [74a64e4] - c-ares 1.31.0: * Enable Query Cache by default. [PR #786] * Enhance Windows DNS configuration change detection to also detect manual DNS configuration changes. [PR #785] * Various legacy MacOS Build fixes. [Issue #782] * Ndots value of zero in `resolv.conf` was not being honored. [852a60a] * Watt-32 build support had been broken for some time. [PR #781] * Distribute `ares_dns_rec_type_tostr` manpage. [PR #778] - c-ares 1.30.0: * Basic support for SIG RR record (RFC 2931 / RFC 2535) [PR #773] * Validation that DNS strings can only consist of printable ascii characters otherwise will trigger a parse failure. [75de16c] and [40fb125] * `QueryCache`: Fix issue where purging on server changes wasn't working. [a6c8fe6] - c-ares 1.29.0: * When using `ARES_OPT_EVENT_THREAD`, automatically reload system configuration when network conditions change. [PR #759] * Apple: reimplement DNS configuration reading to more accurately pull DNS settings. [PR #750] * Add observability into DNS server health via a server state callback, invoked whenever a query finishes. [PR #744] * Add server failover retry behavior, where failed servers are retried with small probability after a minimum delay. [PR #731] * Mark `ares_channel_t *` as `const` in more places in the public API. [PR #758] * Due to a logic flaw, dns name compression writing was not properly implemented which would result in the name prefix not being written for a partial match. This could cause issues in various record types such as `MX` records when using the deprecated API. Regression introduced in 1.28.0. [Issue #757] * Revert OpenBSD `SOCK_DNS` flag, it doesn't do what the docs say it does and causes c-ares to become non-functional. [PR #754] * `ares_getnameinfo()`: loosen validation on `salen` parameter. [Issue #752] * `cmake`: Android requires C99. [PR #748] * `ares_queue_wait_empty()` does not honor `timeout_ms >= 0`. [Issue #742] - c-ares 1.28.1: * Emit warnings when deprecated c-ares functions are used. This can be disabled by passing a compiler definition of `CARES_NO_DEPRECATED`. [PR #732] * Add function `ares_search_dnsrec()` to search for records using the new DNS record data structures. [PR #719] * Rework internals to pass around `ares_dns_record_t` instead of binary data, this introduces new public functions of `ares_query_dnsrec()` and `ares_send_dnsrec()`. [PR #730] * tests: when performing simulated queries, reduce timeouts to make tests run faster. * Replace configuration file parsers with memory-safe parser. [PR #725] * Remove `acountry` completely, the manpage might still get installed otherwise. [Issue #718] * CMake: don't overwrite global required libraries/definitions/includes which could cause build errors for projects chain building c-ares. [Issue #729] * On some platforms, `netinet6/in6.h` is not included by `netinet/in.h` and needs to be included separately. [PR #728] * Fix a potential memory leak in `ares_init()`. [Issue #724] * Some platforms don't have the `isascii()` function. Implement as a macro. [PR #721] * CMake: Fix chain building if `CMAKE` runtime paths not set. * NDots configuration should allow a value of zero. [PR #735]

References: https://www.suse.com/support/update/announcement/2026/suse-su-202623364-1/, https://bugzilla.suse.com/1240955, https://bugzilla.suse.com/1254738, https://bugzilla.suse.com/1270416, https://bugzilla.suse.com/1276290, https://bugzilla.suse.com/1276291, https://www.suse.com/security/cve/CVE-2025-31498, https://www.suse.com/security/cve/CVE-2025-62408, https://www.suse.com/security/cve/CVE-2026-33630, https://www.suse.com/security/cve/CVE-2026-69184, https://www.suse.com/security/cve/CVE-2026-69186