Red Hat Security Advisory: unbound security update
A security vulnerability (CVE-2026-44690) affecting the unbound DNS resolver in Red Hat Enterprise Linux 8 allows cache poisoning due to insufficient validation of RRSIG labels and premature cache writes. This vulnerability could allow an attacker to poison the DNS cache, potentially leading to incorrect DNS responses. Red Hat has issued an important security advisory with updates to fix this issue. The vulnerability affects multiple architectures of Red Hat Enterprise Linux 8 and Extended Life Cycle 8.10. No CVSS score is provided, but the severity is rated as high by Red Hat. A security update is available and should be applied to affected systems to remediate the issue.
AI Analysis
Technical Summary
The unbound DNS resolver in Red Hat Enterprise Linux 8 is vulnerable to cache poisoning via insufficient validation of RRSIG labels and premature cache writes, tracked as CVE-2026-44690. This flaw allows an attacker to insert malicious DNS data into the resolver's cache, potentially causing it to return incorrect DNS responses. Red Hat has released updated unbound packages for multiple architectures (x86_64, s390x, ppc64le, aarch64) in RHEL 8 and Extended Life Cycle 8.10 to address this vulnerability. The advisory RHSA-2026:55784 provides details and instructions for applying the update. No CVSS score is provided in the advisory, but the issue is rated as important (high severity).
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to poison the DNS cache of the unbound resolver, causing it to return incorrect DNS responses. This could lead to redirection of network traffic to malicious sites or denial of service for DNS resolution. The impact is significant for systems relying on unbound for DNS resolution, especially in environments where DNS integrity is critical.
Mitigation Recommendations
Red Hat has released security updates for unbound in Red Hat Enterprise Linux 8 and Extended Life Cycle 8.10 that address this vulnerability. Users should apply the updated packages as described in Red Hat advisory RHSA-2026:55784 and the referenced article https://access.redhat.com/articles/11258. No additional mitigation actions are required beyond applying the official update.
Red Hat Security Advisory: unbound security update
Description
A security vulnerability (CVE-2026-44690) affecting the unbound DNS resolver in Red Hat Enterprise Linux 8 allows cache poisoning due to insufficient validation of RRSIG labels and premature cache writes. This vulnerability could allow an attacker to poison the DNS cache, potentially leading to incorrect DNS responses. Red Hat has issued an important security advisory with updates to fix this issue. The vulnerability affects multiple architectures of Red Hat Enterprise Linux 8 and Extended Life Cycle 8.10. No CVSS score is provided, but the severity is rated as high by Red Hat. A security update is available and should be applied to affected systems to remediate the issue.
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 vulnerable to cache poisoning via insufficient validation of RRSIG labels and premature cache writes, tracked as CVE-2026-44690. This flaw allows an attacker to insert malicious DNS data into the resolver's cache, potentially causing it to return incorrect DNS responses. Red Hat has released updated unbound packages for multiple architectures (x86_64, s390x, ppc64le, aarch64) in RHEL 8 and Extended Life Cycle 8.10 to address this vulnerability. The advisory RHSA-2026:55784 provides details and instructions for applying the update. No CVSS score is provided in the advisory, but the issue is rated as important (high severity).
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to poison the DNS cache of the unbound resolver, causing it to return incorrect DNS responses. This could lead to redirection of network traffic to malicious sites or denial of service for DNS resolution. The impact is significant for systems relying on unbound for DNS resolution, especially in environments where DNS integrity is critical.
Mitigation Recommendations
Red Hat has released security updates for unbound in Red Hat Enterprise Linux 8 and Extended Life Cycle 8.10 that address this vulnerability. Users should apply the updated packages as described in Red Hat advisory RHSA-2026:55784 and the referenced article https://access.redhat.com/articles/11258. No additional mitigation actions are required beyond applying the official update.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:55784
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- null
Threat ID: 6a838c43bf8831d539b4c142
Added to database: 08/17/2026, 22:33:39 UTC
Last enriched: 08/17/2026, 22:56:37 UTC
Last updated: 08/18/2026, 00:41:13 UTC
Views: 3
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