CVE-2026-33630
Fixed in a distro release EPSS <1%CVSS 7.5
c-ares is an asynchronous resolver library. From ver 1.32.3 until 1.34.7, a use-after-free / double-free in c-ares' query-completion handling. The same flaw — a query's callback being invoked while the query is still linked in the channel's internal lookup structures — is present at multiple points in the resend/finish path (timeout handling, response handling, and query dispatch). If the query, or for ares_getaddrinfo() the owning host_query, is freed as a side effect of that callback, it is then accessed and/or freed a second time. This vulnerability is fixed in ver 1.34.7.
Products: c-ares
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 10 | c-ares | 1.34.6-2.el10_2 |
| AlmaLinux 10 | c-ares-devel | 1.34.6-2.el10_2 |
| Alpine 3.21 | c-ares | 1.34.8-r0 |
| Alpine 3.22 | c-ares | 1.34.8-r0 |
| Alpine 3.23 | c-ares | 1.34.8-r0 |
| Alpine 3.24 | c-ares | 1.34.8-r0 |
| Amazon Linux 2023 | nodejs22 | 1:22.23.1-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs22-devel | 1:22.23.1-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs22-docs | 1:22.23.1-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs22-full-i18n | 1:22.23.1-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs22-libs | 1:22.23.1-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs22-npm | 1:10.9.8-1.22.23.1.1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs24 | 1:24.18.0-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs24-devel | 1:24.18.0-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs24-docs | 1:24.18.0-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs24-full-i18n | 1:24.18.0-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs24-libs | 1:24.18.0-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs24-npm | 1:11.16.0-1.24.18.0.1.amzn2023.0.2 |
| Amazon Linux 2023 | v8-12.4-devel | 3:12.4.254.21-1.22.23.1.1.amzn2023.0.2 |
| Amazon Linux 2023 | v8-13.6-devel | 3:13.6.233.17-1.24.18.0.1.amzn2023.0.2 |
| Debian 13 | c-ares | no fix |
| Debian 14 | c-ares | 1.34.7-1 |
| Red Hat Enterprise Linux 10.2 | c-ares | 0:1.34.6-2.el10_2 |
| Red Hat Enterprise Linux 10.2 | c-ares-debuginfo | 0:1.34.6-2.el10_2 |
| Red Hat Enterprise Linux 10.2 | c-ares-debugsource | 0:1.34.6-2.el10_2 |
| Red Hat Enterprise Linux 10.2 | c-ares-devel | 0:1.34.6-2.el10_2 |
| Red Hat hummingbird 1 | c-ares | 0:1.34.7-1.hum1 |
| Red Hat hummingbird 1 | c-ares-devel | 0:1.34.7-1.hum1 |
| Rocky Linux 10 | c-ares | 0:1.34.6-2.el10_2 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise Micro 5.3 | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise Micro 5.4 | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise Micro 5.5 | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise Server 12 SP5-LTSS | libcares2 | 1.9.1-9.24.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise Server 16.0 | c-ares | 1.34.8-160000.1.1 |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | libcares2 | 1.9.1-9.24.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | c-ares | 1.34.8-150000.3.29.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | c-ares | 1.34.8-160000.1.1 |
| SUSE Linux Micro 6.0 | c-ares | 1.34.8-1.1 |
| SUSE Linux Micro 6.1 | c-ares | 1.34.8-slfo.1.1_1.1 |
| Ubuntu 25.10 | c-ares | no fix |
| Ubuntu 26.04 LTS | c-ares | 1.34.6-1ubuntu0.1 |
| openSUSE Leap 16.0 | c-ares | 1.34.8-160000.1.1 |
| openSUSE Tumbleweed | c-ares | 1.34.8-1.1 |