Red Hat Security Advisory: unbound security update
Multiple security vulnerabilities have been identified in the unbound DNS resolver packages used in Red Hat Enterprise Linux 9. These include denial of service issues caused by excessive EDNS options, large DNS resource record sets, and degraded resolution performance, as well as a cache manipulation vulnerability via 'ghost domain names'. Red Hat has issued an important security advisory with updates to address these issues.
AI Analysis
Technical Summary
The unbound packages in Red Hat Enterprise Linux 9 contain four security vulnerabilities: CVE-2026-41292 allows denial of service via excessive EDNS options; CVE-2026-40622 enables cache manipulation through 'ghost domain names'; CVE-2026-44390 causes denial of service due to excessive resource consumption with large DNS resource record sets; and CVE-2026-42534 results in denial of service from degraded resolution performance in jostle logic. Red Hat has released updated packages to remediate these vulnerabilities as detailed in advisory RHSA-2026:36777.
Potential Impact
These vulnerabilities can lead to denial of service conditions affecting the DNS resolution service provided by unbound, potentially disrupting network operations. The cache manipulation vulnerability could allow an attacker to influence DNS responses, impacting DNS integrity. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated unbound packages for Red Hat Enterprise Linux 9 to address these vulnerabilities. Users should apply the security update described in advisory RHSA-2026:36777 promptly. For detailed update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigation actions are indicated by the vendor.
Red Hat Security Advisory: unbound security update
Description
Multiple security vulnerabilities have been identified in the unbound DNS resolver packages used in Red Hat Enterprise Linux 9. These include denial of service issues caused by excessive EDNS options, large DNS resource record sets, and degraded resolution performance, as well as a cache manipulation vulnerability via 'ghost domain names'. Red Hat has issued an important security advisory with updates to address these issues.
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The unbound packages in Red Hat Enterprise Linux 9 contain four security vulnerabilities: CVE-2026-41292 allows denial of service via excessive EDNS options; CVE-2026-40622 enables cache manipulation through 'ghost domain names'; CVE-2026-44390 causes denial of service due to excessive resource consumption with large DNS resource record sets; and CVE-2026-42534 results in denial of service from degraded resolution performance in jostle logic. Red Hat has released updated packages to remediate these vulnerabilities as detailed in advisory RHSA-2026:36777.
Potential Impact
These vulnerabilities can lead to denial of service conditions affecting the DNS resolution service provided by unbound, potentially disrupting network operations. The cache manipulation vulnerability could allow an attacker to influence DNS responses, impacting DNS integrity. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated unbound packages for Red Hat Enterprise Linux 9 to address these vulnerabilities. Users should apply the security update described in advisory RHSA-2026:36777 promptly. For detailed update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigation actions 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-2026:36777
- Cve Count
- 4
- Additional Cves
- ["CVE-2026-41292","CVE-2026-42534","CVE-2026-44390"]
- Cvss Version
- null
Threat ID: 6a885f13acd9273b493f77e2
Added to database: 08/21/2026, 14:22:11 UTC
Last enriched: 08/21/2026, 14:25:12 UTC
Last updated: 08/22/2026, 03:51:58 UTC
Views: 3
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.