High8.1Red Hat & Ubuntu Linux
Unbound DNSSEC Validator Use-After-Free via Deep Copy Pointer Overwrite Leading to DoS and Possible Remote Code Execution
CVE-2026-33278 Published May 20, 2026
CVE-2026-33278
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
Unbound DNSSEC Validator Use-After-Free via Deep Copy Pointer Overwrite Leading to DoS and Possible Remote Code Execution. Red Hat rates this important (CVSS 8.1). Weakness: CWE-416. Affected package(s): unbound-main, unbound. Resolved in Red Hat advisory RHSA-2026:23231 — update the affected packages (`sudo dnf update`).
Affected versions
- unbound-main-1.25.1-0.1.hum1
- unbound-0:1.24.2-7.el10_2.1
- unbound-0:1.24.2-3.el9_8.1
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
Fixed versions
- RHSA-2026:23231
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Update the affected package(s) to the fixed version shipped in RHSA-2026:23231 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
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