Resource Exhaustion Affecting libcares2 package, versions <1.34.8-150000.3.29.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.52% (44th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-SLES157-LIBCARES2-19779883
  • published14 Sept 2026
  • disclosed7 Sept 2026

Introduced: 7 Sep 2026

CVE-2026-69186  (opens in a new tab)
CWE-400  (opens in a new tab)

How to fix?

Upgrade SLES:15.7 libcares2 to version 1.34.8-150000.3.29.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libcares2 package and not the libcares2 package as distributed by SLES. See How to fix? for SLES:15.7 relevant fixed versions and status.

c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_parse() trusts the attacker-controlled ANCOUNT, NSCOUNT, and ARCOUNT fields before confirming that the DNS response contains enough bytes for the claimed records. Because process_answer() invokes parsing before transaction ID and question validation, a malicious DNS response can cause ares_dns_record_rr_prealloc() and ares_array_set_size() to reserve disproportionate heap memory for a tiny message. Repeated responses create large allocation and release cycles that can degrade or deny name resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7.

CVSS Base Scores

version 3.1