CVE-2026-69184
Fixed in a distro release EPSS <1%CVSS 7.5
c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_name_parse() enforces backward DNS compression pointers but does not bound the total pointer hops or assembled name length. A malicious DNS server can send a response containing a long descending pointer chain and many resource records whose NAME or RDATA fields refer to the chain, causing repeated decompression work that grows quadratically with message size. A single crafted response can stall the single-threaded c-ares event loop and deny DNS resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7.
Products: c-ares
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux 2023 | nodejs22 | 1:22.23.2-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs22-devel | 1:22.23.2-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs22-docs | 1:22.23.2-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs22-full-i18n | 1:22.23.2-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs22-libs | 1:22.23.2-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs22-npm | 1:10.9.8-1.22.23.2.1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs24 | 1:24.18.1-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs24-devel | 1:24.18.1-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs24-docs | 1:24.18.1-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs24-full-i18n | 1:24.18.1-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs24-libs | 1:24.18.1-1.amzn2023.0.2 |
| Amazon Linux 2023 | nodejs24-npm | 1:11.16.0-1.24.18.1.1.amzn2023.0.2 |
| Amazon Linux 2023 | v8-12.4-devel | 3:12.4.254.21-1.22.23.2.1.amzn2023.0.2 |
| Amazon Linux 2023 | v8-13.6-devel | 3:13.6.233.17-1.24.18.1.1.amzn2023.0.2 |
| Debian 13 | c-ares | no fix |
| Debian 14 | c-ares | 1.34.7-1 |
| Red Hat hummingbird 1 | c-ares | 0:1.34.8-2.hum1 |
| Red Hat hummingbird 1 | c-ares-devel | 0:1.34.8-2.hum1 |
| 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 22.04 LTS | c-ares | 1.18.1-1ubuntu0.22.04.4 |
| Ubuntu 24.04 LTS | c-ares | 1.27.0-1.0ubuntu1.1 |
| Ubuntu 26.04 LTS | c-ares | 1.34.6-1ubuntu0.2 |
| Ubuntu Pro 16.04 LTS | c-ares | 1.10.0-3ubuntu0.2+esm4 |
| Ubuntu Pro 18.04 LTS | c-ares | 1.14.0-1ubuntu0.2+esm3 |
| Ubuntu Pro 20.04 LTS | c-ares | 1.15.0-1ubuntu0.5+esm1 |
| openSUSE Leap 16.0 | c-ares | 1.34.8-160000.1.1 |
| openSUSE Tumbleweed | c-ares | 1.34.8-1.1 |