VDB
CVE-2026-69184
CVE-2026-69184
PUBLISHED
CVSS 7.5 HIGH
Reported by GitHub_M · Published September 18, 2026
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.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| c-ares | c-ares | < 1.34.7 |
| c-ares | c-ares | < 1.34.7, < 1.34.7 |
Timeline
- Aug 13, 2026 CVE Published
- Sep 19, 2026 EPSS Score
- Sep 21, 2026 EPSS Score
- Sep 22, 2026 EPSS Score
- Sep 24, 2026 EPSS Score
- Sep 26, 2026 EPSS Score
- Sep 30, 2026 EPSS Score
- Oct 2, 2026 EPSS Score
- Oct 6, 2026 EPSS Score
- Oct 8, 2026 EPSS Score
References
- https://github.com/c-ares/c-ares/security/advisories/GHSA-pjmc-gx33-gc76 x_refsource_CONFIRM
- https://github.com/c-ares/c-ares/pull/1164 x_refsource_MISC
- https://github.com/c-ares/c-ares/pull/1210 x_refsource_MISC
- https://github.com/c-ares/c-ares/commit/5c8341ba6ff3a8e4e4dfd616f8ed0418838b8b7b x_refsource_MISC
- https://github.com/c-ares/c-ares/commit/f1288bbc70e9a1e0a77134c2382157e52d326aea x_refsource_MISC
- https://github.com/c-ares/c-ares/releases/tag/v1.34.7 x_refsource_MISC