Skip to content
fr Sign in
7.5 High

CVE-2026-69184 c-ares is an asynchronous resolver library

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.

Affected products and versions

Product Affected versions Fixed in
c-ares 1.34 earliest → < 1.34.7 1.34.7

References

Timeline

  1. Published
  2. Last modified

Other CVEs of c-ares

The 10 CVEs of c-ares →
CVE-2026-69186 c-ares is an asynchronous resolver library 5.3 Medium CVE-2026-33630 c-ares is an asynchronous resolver library 7.5 High CVE-2025-62408 c-ares is an asynchronous resolver library 5.9 Medium CVE-2025-31498 c-ares is an asynchronous resolver library 8.3 High
Track this CVE