Detections
Analytics

Echo: c-ares-1.29.0: security update to 1.29.0+e1c-ares-1.34.6: security update to 1.34.6+e1

medium Tenable Cloud Security Plugin ID 476257

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-69186)

Solution

Update the c-ares-1.29.0 library and its related packages to version 1.29.0+e1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-69186

Plugin Details

Severity: Medium

ID: 476257

Version: Revision 1.1

Type: Local

Published: 10/20/2026

Updated: 10/20/2026

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-69186

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/20/2026

Vulnerability Publication Date: 9/18/2026

Reference Information

CVE: CVE-2026-69186