CVE-2026-52863
CVE-2026-52863: 1 tracked advisory record across Red Hat. Compare source-reported impact, fixes and remediation.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityMedium5.9
Medium [CVE-2026-52863] Denial of service due to memory corruption under specific configurations.
CVE-2026-52863Source published Source updated
In NLnet Labs Unbound 1.25.0 up to and including 1.25.1, a fix that makes the 'respip' and 'dns64' modules work together, creates a shallow copy of the view name in effect that could lead to memory corruption if the owner of the original view name is jostled out when Unbound is under pressure. Unbound needs to be configured with one of 'respip'/'rpz' modules, together with a module that can attach subqueries (respip CNAME redirection, dns64, subnetcache) and a configured 'access-control-view' while Unbound is under pressure so that joslte logic kicks in and starts dropping slow queries. Likelihood of a crash is low, since it relies heavily on the underlying memory allocator and the memory layout. Debug memory builds (e.g., ASAN) that catch the free terminate the server. A flaw was found…
- Affected products in this advisory
- Red Hat Hardened Images
- Source-reported affected versions
- 1.25.0
- 1.25.1
- Source-reported fixed versions
- unbound-main-1.25.2-0.1.hum1
- RHSA-2026:43588
- Mitigation guidance
- To mitigate this issue, avoid configuring Unbound with a combination of 'respip' or 'rpz' modules, subquery attachment features (such as respip CNAME redirection, dns64, or subnetcache), and 'access-control-view' if these functionalities are not strictly required. Disabling these specific configurations will prevent the conditions under which memory corruption can occur. Any changes to Unbound's configuration will require a service restart to take effect, which may temporarily interrupt DNS resolution services.
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