CVE-2026-50046
CVE-2026-50046: 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 severityLow3.7
Low [CVE-2026-50046] Denial of Service due to freed pointer dereference in DNS-over-TLS handling
CVE-2026-50046Source published Source updated
In NLnet Labs Unbound 1.15.0 up to and including 1.25.1, the TLS server name used for DNS-over-TLS (DoT) forwarded queries is tied to a struct's ('serviced_query') lifetime but also referenced by another struct ('waiting_tcp'). When the owning struct is jostled out of the mesh while the DoT TCP stream is still handshaking it frees the storage behind the referenced string and if the TLS stream then errors out, it dereferences the freed pointer. The dereference is read-only and the practical impact is a daemon crash resulting in denial of service. A malicious actor that knows a DoT forwarding/stub Unbound's configuration could exploit the vulnerability by quering records in the appropriate zone while keeping Unbound uder pressure so that the jostle logic kicks in. If answers for the…
- Affected products in this advisory
- Red Hat Hardened Images
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
2 more entries in the full advisory.
- Source-reported affected versions
- 1.15.0
- 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 `#authname` suffix in DNS-over-TLS (DoT) forwarding or stub zones if not strictly required. If the `#authname` suffix is necessary, restrict network access to the Unbound instance to trusted clients only. This may involve configuring firewall rules to limit inbound connections to the DoT port (typically 853) from known, secure sources. After modifying Unbound's configuration, the service must be reloaded or restarted for the changes to take effect. This action may temporarily interrupt DNS resolution services.
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