DEBIAN-CVE-2026-69186

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Source

https://security-tracker.debian.org/tracker/CVE-2026-69186

Import Source

https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-69186.json

JSON Data

https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-69186

Upstream

CVE-2026-69186

Published

2026-09-18T18:17:11Z

Modified

2026-09-19T05:00:12Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator

Summary

[none]

Details

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.

References

https://security-tracker.debian.org/tracker/CVE-2026-69186

Affected packages

Debian:13 / c-ares

Package

Name: c-ares
Purl: pkg:deb/debian/c-ares?arch=source&distro=trixie

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.34.5-1

1.34.5-1+deb13u1

1.34.6-1

1.34.7-1

1.34.8-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-69186.json"

Debian:14 / c-ares