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 10. 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 update addressing these issues.
AI Analysis
Technical Summary
The unbound packages in Red Hat Enterprise Linux 10 contain four security vulnerabilities: CVE-2026-41292 (Denial of Service via excessive EDNS options), CVE-2026-40622 (Cache manipulation via 'ghost domain names' attack), CVE-2026-44390 (Denial of Service due to excessive resource consumption with large DNS Resource Record Sets), and CVE-2026-42534 (Denial of Service due to degraded resolution performance in jostle logic). These vulnerabilities affect the DNS resolver's ability to properly validate, cache, and resolve DNS queries, potentially allowing denial of service conditions or cache manipulation. Red Hat has released updated unbound packages for Red Hat Enterprise Linux 10 to address these issues.
Potential Impact
Successful exploitation of these vulnerabilities could result in denial of service conditions affecting DNS resolution or manipulation of the DNS cache, potentially impacting system and network reliability. The advisory rates the security impact as Important (high severity). There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated unbound packages for Red Hat Enterprise Linux 10 that fix these vulnerabilities. Users should apply the security update as detailed in Red Hat advisory RHSA-2026:36320 and the referenced article https://access.redhat.com/articles/11258. No additional mitigation steps 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 10. 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 update addressing these issues.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The unbound packages in Red Hat Enterprise Linux 10 contain four security vulnerabilities: CVE-2026-41292 (Denial of Service via excessive EDNS options), CVE-2026-40622 (Cache manipulation via 'ghost domain names' attack), CVE-2026-44390 (Denial of Service due to excessive resource consumption with large DNS Resource Record Sets), and CVE-2026-42534 (Denial of Service due to degraded resolution performance in jostle logic). These vulnerabilities affect the DNS resolver's ability to properly validate, cache, and resolve DNS queries, potentially allowing denial of service conditions or cache manipulation. Red Hat has released updated unbound packages for Red Hat Enterprise Linux 10 to address these issues.
Potential Impact
Successful exploitation of these vulnerabilities could result in denial of service conditions affecting DNS resolution or manipulation of the DNS cache, potentially impacting system and network reliability. The advisory rates the security impact as Important (high severity). There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated unbound packages for Red Hat Enterprise Linux 10 that fix these vulnerabilities. Users should apply the security update as detailed in Red Hat advisory RHSA-2026:36320 and the referenced article 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-2026:36320
- Cve Count
- 4
- Additional Cves
- ["CVE-2026-41292","CVE-2026-42534","CVE-2026-44390"]
- Cvss Version
- null
Threat ID: 6a885f13acd9273b493f77ef
Added to database: 08/21/2026, 14:22:11 UTC
Last enriched: 08/21/2026, 14:25:20 UTC
Last updated: 08/22/2026, 03:51:58 UTC
Views: 2
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