# CVE-2026-69184: c-ares: CPU-exhaustion denial of service via unbounded DNS name compression pointer chains CVE-2026-69184 is fixed in 23 products on 1 platform, first by DEBIAN-CVE-2026-69184, released August 11, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-69184 - Priority: High - CVSS: 7.5 (Important) - EPSS: 0.0048 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 17, 2026 - Weakness: Inefficient Algorithmic Complexity - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69184 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | c-ares Debian 14 | 1.34.7-1 | [DEBIAN-CVE-2026-69184](https://patchblox.com/security/data/fix/linux/debian-cve-2026-69184.md) | Aug 11, 2026 | | Linux | c-ares opensuse-leap 16.0 | 1.34.8-160000.1.1 | [OPENSUSE-SU-2026:21721-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21721-1.md) | Sep 1, 2026 | | Linux | c-ares sles 15.6 | 1.34.8-150000.3.29.1 | [SUSE-SU-2026:4021-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4021-1.md) | Sep 7, 2026 | | Linux | c-ares sles 15.7 | 1.34.8-150000.3.29.1 | [SUSE-SU-2026:4021-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4021-1.md) | Sep 7, 2026 | | Linux | c-ares sles 16.0 | 1.34.8-160000.1.1 | [SUSE-SU-2026:23597-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23597-1.md) | Sep 1, 2026 | | Linux | libc-ares2 Ubuntu 18.04.6 LTS (bionic) | 1.14.0-1ubuntu0.2+esm3 | [libc-ares2 1.14.0-1ubuntu0.2+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc-ares2-1.14.0-1ubuntu0.2-esm3.md) | Sep 18, 2026 | | Linux | libc-ares2 Ubuntu 20.04 LTS (focal) | 1.15.0-1ubuntu0.5+esm1 | [libc-ares2 1.15.0-1ubuntu0.5+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc-ares2-1.15.0-1ubuntu0.5-esm1.md) | Sep 18, 2026 | | Linux | libc-ares2 Ubuntu 22.04.1 LTS (jammy) | 1.18.1-1ubuntu0.22.04.4 | [libc-ares2 1.18.1-1ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libc-ares2-1.18.1-1ubuntu0.22.04.4.md) | Sep 18, 2026 | | Linux | libc-ares2 Ubuntu 26.04.1 LTS (resolute) | 1.34.6-1ubuntu0.2 | [libc-ares2 1.34.6-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libc-ares2-1.34.6-1ubuntu0.2.md) | Sep 18, 2026 | | Linux | libcares2 Ubuntu 24.04.5 LTS (noble) | 1.27.0-1.0ubuntu1.1 | [libcares2 1.27.0-1.0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcares2-1.27.0-1.0ubuntu1.1.md) | Sep 18, 2026 | | Linux | libcares2 Ubuntu 26.04.1 LTS (resolute) | 1.34.6-1ubuntu0.2 | [libcares2 1.34.6-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcares2-1.34.6-1ubuntu0.2.md) | Sep 18, 2026 | | Linux | nodejs22 amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-debuginfo amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-debugsource amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-devel amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-docs amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-full-i18n amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-libs amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-libs-debuginfo amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs22-npm amzn 2023 | 1:10.9.8-1.22.23.2.1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | nodejs24 amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 | | Linux | nodejs24-debuginfo amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 | | Linux | nodejs24-debugsource amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 | | Linux | nodejs24-devel amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 | | Linux | nodejs24-docs amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 | | Linux | nodejs24-full-i18n amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 | | Linux | nodejs24-libs amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 | | Linux | nodejs24-libs-debuginfo amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 | | Linux | nodejs24-npm amzn 2023 | 1:11.16.0-1.24.18.1.1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 | | Linux | v8-12.4-devel amzn 2023 | 3:12.4.254.21-1.22.23.2.1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 | | Linux | v8-13.6-devel amzn 2023 | 3:13.6.233.17-1.24.18.1.1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 | --- Data as of 2026-11-08T19:12:23Z UTC. 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