Red Hat Security Advisory: dnsmasq security update
Multiple vulnerabilities have been identified in the dnsmasq packages used in Red Hat Enterprise Linux 8, including heap buffer overflows, infinite loops, out-of-bounds reads, and source validation bypasses. These issues affect the DNS forwarding and DHCP server functionality of dnsmasq. Red Hat has issued an important security advisory with updated dnsmasq packages to address these vulnerabilities. The update is available for various architectures and extended life cycle versions of Red Hat Enterprise Linux 8. Users are advised to apply the provided updates to mitigate these security issues.
AI Analysis
Technical Summary
The dnsmasq packages in Red Hat Enterprise Linux 8 contain several security vulnerabilities: a heap buffer overflow via NAME_ESCAPE expansion (CVE-2026-2291), an infinite loop in NSEC bitmap parsing (CVE-2026-4890), a heap out-of-bounds read due to RRSIG rdlen underflow (CVE-2026-4891), a DHCPv6 CLID buffer overflow in a helper process (CVE-2026-4892), and a broken ECS source validation bypass (CVE-2026-4893). These vulnerabilities impact the DNS and DHCP functionalities provided by dnsmasq. Red Hat has released updated dnsmasq packages to fix these issues across multiple supported architectures and extended life cycle versions.
Potential Impact
The vulnerabilities could lead to memory corruption issues such as buffer overflows and out-of-bounds reads, as well as denial-of-service conditions due to infinite loops and bypass of source validation. These issues affect the dnsmasq service, which is critical for DNS forwarding and DHCP services. Exploitation could disrupt network services or potentially allow for further compromise depending on the environment. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated dnsmasq packages that address all identified vulnerabilities. Users of Red Hat Enterprise Linux 8 and its extended life cycle versions should apply these updates promptly. Detailed instructions and package downloads are available in the Red Hat advisory RHSA-2026:20589 at https://access.redhat.com/errata/RHSA-2026:20589. No additional mitigation steps are indicated beyond applying the official update.
Red Hat Security Advisory: dnsmasq security update
Description
Multiple vulnerabilities have been identified in the dnsmasq packages used in Red Hat Enterprise Linux 8, including heap buffer overflows, infinite loops, out-of-bounds reads, and source validation bypasses. These issues affect the DNS forwarding and DHCP server functionality of dnsmasq. Red Hat has issued an important security advisory with updated dnsmasq packages to address these vulnerabilities. The update is available for various architectures and extended life cycle versions of Red Hat Enterprise Linux 8. Users are advised to apply the provided updates to mitigate these security issues.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The dnsmasq packages in Red Hat Enterprise Linux 8 contain several security vulnerabilities: a heap buffer overflow via NAME_ESCAPE expansion (CVE-2026-2291), an infinite loop in NSEC bitmap parsing (CVE-2026-4890), a heap out-of-bounds read due to RRSIG rdlen underflow (CVE-2026-4891), a DHCPv6 CLID buffer overflow in a helper process (CVE-2026-4892), and a broken ECS source validation bypass (CVE-2026-4893). These vulnerabilities impact the DNS and DHCP functionalities provided by dnsmasq. Red Hat has released updated dnsmasq packages to fix these issues across multiple supported architectures and extended life cycle versions.
Potential Impact
The vulnerabilities could lead to memory corruption issues such as buffer overflows and out-of-bounds reads, as well as denial-of-service conditions due to infinite loops and bypass of source validation. These issues affect the dnsmasq service, which is critical for DNS forwarding and DHCP services. Exploitation could disrupt network services or potentially allow for further compromise depending on the environment. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated dnsmasq packages that address all identified vulnerabilities. Users of Red Hat Enterprise Linux 8 and its extended life cycle versions should apply these updates promptly. Detailed instructions and package downloads are available in the Red Hat advisory RHSA-2026:20589 at https://access.redhat.com/errata/RHSA-2026:20589. No additional mitigation steps are indicated 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-2026:20589
- Cve Count
- 5
- Additional Cves
- ["CVE-2026-4890","CVE-2026-4891","CVE-2026-4892","CVE-2026-4893"]
- Cvss Version
- null
Threat ID: 6a16097ce29bf47b50648826
Added to database: 5/26/2026, 8:58:36 PM
Last enriched: 5/26/2026, 11:03:33 PM
Last updated: 5/27/2026, 4:54:15 AM
Views: 2
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