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CVE-2026-50252 is a DNS cache-poisoning weakness in NLnet Labs Unbound versions 1.4.22 through 1.25.1. With SO_REUSEPORT enabled, Unbound partitions its available outbound UDP source-port space into disjoint subsets assigned to worker threads at startup. Kernel SO_REUSEPORT load balancing deterministically selects a worker based on the incoming client UDP source IP address and port. Because outbound recursive queries use only the selected worker's port subset, observation of an outbound query identifies the worker that handled the corresponding client request. An attacker can map incoming source ports for a fixed source address to worker threads, reducing the effective source-port search space and undermining UDP source-port randomization used to resist DNS cache poisoning.
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so-reuseport: no in the Unbound configuration, where operationally feasible. Restart Unbound after changing the setting. This may affect load-distribution characteristics and should be validated against deployment performance requirements.Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability tracked as CVE-2026-50252 affecting Unbound-related packages distributed for AlmaLinux 9. The supplied CVSS v3 vector indicates adjacent-network attack access, no privileges or user interaction, and high integrity and availability impact across a changed scope.
A vulnerability tracked as CVE-2026-50252 affecting Oracle Linux 9 Unbound-related packages, including python3-unbound, unbound-devel, unbound-dracut, and unbound-libs. The supplied CVSS vectors indicate an adjacent-network attack with no privileges or user interaction required and high integrity and availability impact, including scope effects.
A vulnerability tracked as CVE-2026-50252 affecting Unbound-related packages on AlmaLinux 10.
A vulnerability identified as CVE-2026-50252 affecting Rocky Linux 10 Unbound packages, including unbound, unbound-libs, unbound-utils, unbound-anchor, python3-unbound, and associated development/debug packages.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.