Red Hat Security Advisory: unbound security update
Multiple vulnerabilities have been identified in the unbound DNS resolver packages used in Red Hat Enterprise Linux 8. 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. The update is available for various Red Hat Enterprise Linux 8 architectures and extended life cycle versions.
AI Analysis
Technical Summary
The unbound DNS resolver in Red Hat Enterprise Linux 8 is affected by 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 could allow an attacker to cause denial of service conditions or manipulate cache entries. Red Hat has released updated unbound packages to address these issues as detailed in advisory RHSA-2026:37282.
Potential Impact
Successful exploitation of these vulnerabilities could lead to denial of service conditions on systems running the affected unbound DNS resolver, potentially disrupting DNS resolution services. The cache manipulation vulnerability could allow an attacker to influence DNS responses by injecting 'ghost domain names', potentially 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 8 and its extended life cycle versions that address these vulnerabilities. Users should apply the security update as described in Red Hat advisory RHSA-2026:37282 and the referenced article https://access.redhat.com/articles/11258 to remediate these issues. No additional mitigation steps are indicated by the vendor advisory.
Red Hat Security Advisory: unbound security update
Description
Multiple vulnerabilities have been identified in the unbound DNS resolver packages used in Red Hat Enterprise Linux 8. 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. The update is available for various Red Hat Enterprise Linux 8 architectures and extended life cycle versions.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The unbound DNS resolver in Red Hat Enterprise Linux 8 is affected by 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 could allow an attacker to cause denial of service conditions or manipulate cache entries. Red Hat has released updated unbound packages to address these issues as detailed in advisory RHSA-2026:37282.
Potential Impact
Successful exploitation of these vulnerabilities could lead to denial of service conditions on systems running the affected unbound DNS resolver, potentially disrupting DNS resolution services. The cache manipulation vulnerability could allow an attacker to influence DNS responses by injecting 'ghost domain names', potentially 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 8 and its extended life cycle versions that address these vulnerabilities. Users should apply the security update as described in Red Hat advisory RHSA-2026:37282 and the referenced article https://access.redhat.com/articles/11258 to remediate these issues. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:37282
- Cve Count
- 4
- Additional Cves
- ["CVE-2026-41292","CVE-2026-42534","CVE-2026-44390"]
- Cvss Version
- null
Threat ID: 6a885f13acd9273b493f77e0
Added to database: 08/21/2026, 14:22:11 UTC
Last enriched: 08/21/2026, 14:25:04 UTC
Last updated: 08/22/2026, 03:51:58 UTC
Views: 2
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