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CVE-2026-18948 is a critical unsafe deserialization vulnerability in Feast involving user-defined functions stored in the registry and serialized with the dill library. Feast deserializes these registry-stored UDF objects without adequate trust validation or authorization enforcement, allowing attacker-controlled serialized content to be processed as executable Python objects. In default configurations, a remote attacker can store a malicious UDF and trigger unauthenticated arbitrary code execution on the feature server. The flaw also affects deserialization paths on the registry server, where an authenticated attacker can bypass authorization checks during deserialization and execute arbitrary code. Because the vulnerable objects are shared through the registry, exploitation can affect multiple Feast-related components and create opportunities for cross-tenant access and internal pivoting.
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No public exploit code observed for this vulnerability.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical unsafe deserialization vulnerability in Feast that enables unauthenticated remote code execution on feature-server pods in default configurations.
A critical unsafe deserialization vulnerability in Feast involving registry-stored UDFs serialized with dill, enabling arbitrary code execution on the feature server and registry server, with potential cross-tenant data access and lateral movement.
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.