Red Hat Security Advisory: aardvark-dns security update
A denial of service vulnerability (CVE-2026-35406) exists in aardvark-dns, an authoritative DNS server for A/AAAA container records used in Red Hat Enterprise Linux 9 and 10. The flaw allows denial of service via truncated TCP DNS queries and connection resets. Red Hat has released security updates addressing this issue for affected versions of aardvark-dns in RHEL 9 and 10.
AI Analysis
Technical Summary
CVE-2026-35406 is a denial of service vulnerability in aardvark-dns, an authoritative DNS server component for A/AAAA container records that forwards other requests to configured resolvers. The vulnerability is triggered by truncated TCP DNS queries and connection resets, which can cause the service to become unavailable. Red Hat has issued security advisories RHSA-2026:36318 and RHSA-2026:36782 providing updated packages that fix this issue for Red Hat Enterprise Linux 9 and 10 across various architectures including x86_64, s390x, ppc64le, and aarch64. The advisories include detailed package versions and instructions for applying the update.
Potential Impact
Successful exploitation of this vulnerability can cause denial of service by disrupting the aardvark-dns service through malformed TCP DNS queries. This impacts the availability of DNS resolution for affected systems running Red Hat Enterprise Linux 9 and 10 with vulnerable versions of aardvark-dns. There are no known exploits in the wild at this time.
Mitigation Recommendations
A security update is available from Red Hat that addresses this vulnerability. Users should apply the updated aardvark-dns packages as provided in Red Hat advisories RHSA-2026:36318 and RHSA-2026:36782. Detailed instructions for applying the update are available at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: aardvark-dns security update
Description
A denial of service vulnerability (CVE-2026-35406) exists in aardvark-dns, an authoritative DNS server for A/AAAA container records used in Red Hat Enterprise Linux 9 and 10. The flaw allows denial of service via truncated TCP DNS queries and connection resets. Red Hat has released security updates addressing this issue for affected versions of aardvark-dns in RHEL 9 and 10.
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-35406 is a denial of service vulnerability in aardvark-dns, an authoritative DNS server component for A/AAAA container records that forwards other requests to configured resolvers. The vulnerability is triggered by truncated TCP DNS queries and connection resets, which can cause the service to become unavailable. Red Hat has issued security advisories RHSA-2026:36318 and RHSA-2026:36782 providing updated packages that fix this issue for Red Hat Enterprise Linux 9 and 10 across various architectures including x86_64, s390x, ppc64le, and aarch64. The advisories include detailed package versions and instructions for applying the update.
Potential Impact
Successful exploitation of this vulnerability can cause denial of service by disrupting the aardvark-dns service through malformed TCP DNS queries. This impacts the availability of DNS resolution for affected systems running Red Hat Enterprise Linux 9 and 10 with vulnerable versions of aardvark-dns. There are no known exploits in the wild at this time.
Mitigation Recommendations
A security update is available from Red Hat that addresses this vulnerability. Users should apply the updated aardvark-dns packages as provided in Red Hat advisories RHSA-2026:36318 and RHSA-2026:36782. Detailed instructions for applying the update are available at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:36318
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- null
Threat ID: 6a4e4ee3c9d9e3dbe328969b
Added to database: 07/08/2026, 13:21:39 UTC
Last enriched: 08/21/2026, 16:39:53 UTC
Last updated: 08/22/2026, 10:52:08 UTC
Views: 68
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.