Red Hat Security Advisory: aardvark-dns security update
A denial of service vulnerability (CVE-2026-35406) affects aardvark-dns, an authoritative DNS server component in Red Hat Enterprise Linux 9. The issue involves handling truncated TCP DNS queries and connection resets, which can cause service disruption. Red Hat has released a security update to address this moderate severity flaw. The update is available for multiple architectures and variants of Red Hat Enterprise Linux 9. No known exploits are reported in the wild at this time.
AI Analysis
Technical Summary
CVE-2026-35406 is a denial of service vulnerability in aardvark-dns, the authoritative DNS server for A/AAAA container records in Red Hat Enterprise Linux 9. The vulnerability is triggered by specially crafted truncated TCP DNS queries and connection resets, which can disrupt the DNS service. Red Hat has issued a security advisory (RHSA-2026:36318) and released updated packages (version 1.17.1-1.el9_8) for affected Red Hat Enterprise Linux 9 variants and architectures to remediate this issue.
Potential Impact
Successful exploitation of this vulnerability can cause denial of service by disrupting the aardvark-dns server's ability to respond to DNS queries, potentially impacting DNS resolution on affected systems. There are no reports of active exploitation in the wild.
Mitigation Recommendations
Red Hat has released updated aardvark-dns packages that fix this vulnerability. Users should apply the security update as described in Red Hat advisory RHSA-2026:36318 and the referenced update article (https://access.redhat.com/articles/11258). Applying this update will remediate the denial of service issue. 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) affects aardvark-dns, an authoritative DNS server component in Red Hat Enterprise Linux 9. The issue involves handling truncated TCP DNS queries and connection resets, which can cause service disruption. Red Hat has released a security update to address this moderate severity flaw. The update is available for multiple architectures and variants of Red Hat Enterprise Linux 9. No known exploits are reported in the wild at this time.
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, the authoritative DNS server for A/AAAA container records in Red Hat Enterprise Linux 9. The vulnerability is triggered by specially crafted truncated TCP DNS queries and connection resets, which can disrupt the DNS service. Red Hat has issued a security advisory (RHSA-2026:36318) and released updated packages (version 1.17.1-1.el9_8) for affected Red Hat Enterprise Linux 9 variants and architectures to remediate this issue.
Potential Impact
Successful exploitation of this vulnerability can cause denial of service by disrupting the aardvark-dns server's ability to respond to DNS queries, potentially impacting DNS resolution on affected systems. There are no reports of active exploitation in the wild.
Mitigation Recommendations
Red Hat has released updated aardvark-dns packages that fix this vulnerability. Users should apply the security update as described in Red Hat advisory RHSA-2026:36318 and the referenced update article (https://access.redhat.com/articles/11258). Applying this update will remediate the denial of service issue. 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: 07/08/2026, 13:38:07 UTC
Last updated: 07/08/2026, 22:28:25 UTC
Views: 2
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.