SUSE-SU-2026:23364-1: important: Security update for c-ares
SLE-SECURITY-UPDATES
null at suse.de
Mon Aug 31 16:31:34 UTC 2026
# Security update for c-ares
Announcement ID: SUSE-SU-2026:23364-1
Release Date: 2026-08-28T11:25:40Z
Rating: important
References:
* bsc#1240955
* bsc#1254738
* bsc#1270416
* bsc#1276290
* bsc#1276291
Cross-References:
* CVE-2025-31498
* CVE-2025-62408
* CVE-2026-33630
* CVE-2026-69184
* CVE-2026-69186
CVSS scores:
* CVE-2025-31498 ( SUSE ): 8.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
* CVE-2025-31498 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
* CVE-2025-31498 ( NVD ): 8.3
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
* CVE-2025-62408 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2025-62408 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-33630 ( SUSE ): 8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
* CVE-2026-33630 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-69184 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-69186 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected Products:
* SUSE Linux Micro 6.0
An update that solves five vulnerabilities can now be installed.
## Description:
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]
## Patch Instructions:
To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".
Alternatively you can run the command listed for your product:
* SUSE Linux Micro 6.0
zypper in -t patch SUSE-SLE-Micro-6.0-870=1
## Package List:
* SUSE Linux Micro 6.0 (aarch64 s390x x86_64)
* libcares2-1.34.8-1.1
* c-ares-debugsource-1.34.8-1.1
* libcares2-debuginfo-1.34.8-1.1
## References:
* https://www.suse.com/security/cve/CVE-2025-31498.html
* https://www.suse.com/security/cve/CVE-2025-62408.html
* https://www.suse.com/security/cve/CVE-2026-33630.html
* https://www.suse.com/security/cve/CVE-2026-69184.html
* https://www.suse.com/security/cve/CVE-2026-69186.html
* https://bugzilla.suse.com/show_bug.cgi?id=1240955
* https://bugzilla.suse.com/show_bug.cgi?id=1254738
* https://bugzilla.suse.com/show_bug.cgi?id=1270416
* https://bugzilla.suse.com/show_bug.cgi?id=1276290
* https://bugzilla.suse.com/show_bug.cgi?id=1276291
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.suse.com/pipermail/sle-security-updates/attachments/20260831/4d1d2957/attachment-0001.htm>
More information about the sle-security-updates
mailing list