USN-8951-1: c-ares Ubuntu

Published
Published 21-10-2026Last modified 22-10-2026

Vulnerability summary

USN-8951-1 is a vulnerability in c-ares Ubuntu with no CVSS score yet.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS scoreNot scoredRisk metrics not yet published.
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 4 · Downstream 0 · Related 4
CVE-2020-22217CVE-2022-4904CVE-2026-69184CVE-2026-69186

Timeline

  1. 21-10-2026
    PublishedVulnerability first disclosed.
  2. 22-10-2026
    Last modifiedVulnerability information updated.

Description

c-ares vulnerabilities It was discovered that c-ares incorrectly parsed certain SOA replies. A remote attacker could possibly use this issue to cause c-ares to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2020-22217) It was discovered that c-ares incorrectly handled certain sortlist strings. A remote attacker could possibly use this issue to cause c-ares to crash, resulting in a denial of service, or execute arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2022-4904) It was discovered that c-ares did not properly limit DNS compression pointer hops or assembled name lengths when parsing DNS names. A remote attacker could possibly use this issue to cause c-ares to use excessive resources, resulting in a denial of service. (CVE-2026-69184) It was discovered that c-ares did not properly validate record count fields before allocating memory when parsing DNS responses. A remote attacker could possibly use this issue to cause c-ares to use excessive resources, resulting in a denial of service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-69186)

CVSS metrics

Risk metrics not yet published.

EPSS trend

No EPSS score has been published for this record yet.

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu1 product
  • c-ares< 1.10.0-3ubuntu0.2+esm4 | < 1.14.0-1ubuntu0.2+esm3 | < 1.15.0-1ubuntu0.5+esm1 | < 1.18.1-1ubuntu0.22.04.4 | < 1.27.0-1.0ubuntu1.1 | < 1.34.6-1ubuntu0.2

1 vendor · 1 product

References

5 links