Description
Buffer overflow vulnerability in c-ares before 1_16_1 thru 1_17_0 via function ares_parse_soa_reply in ares_parse_soa_reply.c.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | c-ares | 1.17.1-1 | — |
| Debian 13 | c-ares | 1.17.1-1 | — |
| Debian 12 | c-ares | 1.17.1-1 | — |
| Debian 10 | c-ares | 1.14.0-1+deb10u4 | DLA-3567-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | c-ares | 1.34.6-1ubuntu0.2 | USN-8951-1 |
| Ubuntu 24.04 LTS | c-ares | 1.27.0-1.0ubuntu1.1 | USN-8951-1 |
| Ubuntu 22.04 LTS | c-ares | 1.18.1-1ubuntu0.22.04.4 | USN-8951-1 |
| Ubuntu 20.04 LTS | c-ares | 1.15.0-1ubuntu0.4 | USN-6376-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | c-ares | 1.15.0-1ubuntu0.5+esm1 | USN-8951-1 |
| Ubuntu Pro 18.04 LTS | c-ares | 1.14.0-1ubuntu0.2+esm3 | USN-8951-1 |
| Ubuntu Pro 16.04 LTS | c-ares | 1.10.0-3ubuntu0.2+esm4 | USN-8951-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | c-ares +1 | 1.13.0-9.el8_9.1 | RHSA-2023:7207 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.8 EUS | c-ares +1 | 1.13.0-6.el8_8.4 | RHSA-2024:0578 |
| RHEL 8.6 EUS | c-ares +1 | 1.13.0-6.el8_6.3 | RHSA-2024:0419 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | c-ares +1 | 1.13.0-9.el8_9.1 | ALSA-2023:7207 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | c-ares | 1.13.0-9.el8_9.1 | RLSA-2023:7207 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | libcares2 | 1.9.1-9.18.1 | SUSE-SU-2023:3690-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | libcares2 | 1.9.1-9.18.1 | SUSE-SU-2023:3690-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | python-gevent | 21.1.2-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | c-ares +1 | 1.13.0-9.el8_9.1 | ELSA-2023-7207 |
Advisories 13
- ALSA-2023:7207 Moderate: c-ares security update AlmaLinux Security Advisories · Oct 29, 2026
- USN-8951-1 c-ares vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- WID-SEC-2024-0218 Red Hat Enterprise Linux's oniguruma, tcpslice, c-ares: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 21, 2026
- RHSA-2024:0578 Red Hat Security Advisory: c-ares security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2024:0419 Red Hat Security Advisory: c-ares security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:7207 Red Hat Security Advisory: c-ares security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- USN-6376-1 c-ares vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-3567-1 c-ares - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:7207 Moderate: c-ares security update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2023:3690-1 Security update for libcares2 SUSE / openSUSE Security Updates · Feb 4, 2026
- NCSC-2025-0382 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Dec 9, 2025
- SSA-202008 SSA-202008: Multiple Vulnerabilities in Ruggedcom Rox Before V2.17.0 Siemens ProductCERT · Dec 9, 2025
- ELSA-2023-7207 Moderate: c-ares security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 22, 2023