CVE-2026-46384

An integer overflow flaw was found in Go Avro in decoding logic. Multiple decoder paths performs unsafe integer conversions and overflow-prone arithmetic operations on attacker-controlled values from Avro payloads. A remote attacker during Avro decoder operations could exploit this issue using specially crafted Avro data to consume excessive resources by bypassing memory limits and triggering crashes leading to a denial of service in affected applications.

This vulnerability affects multiple Avro decoder code paths in affected Go Avro libraries. Red Hat Product Security has assessed this issue as an Important severity vulnerability.

A remote unauthenticated attacker may supply specially crafted Avro payloads containing malformed or excessively large integer values that trigger unsafe integer truncation, arithmetic overflow conditions, or invalid memory allocation operations during decoding.

The vulnerability affects both 32-bit specific integer narrowing paths and several cross-platform arithmetic overflow conditions. There is only a denial-of-service impact but not confidentiality or integrity impact. Therefore, Red Hat assessed the impact as limited to Availability (A:H).

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Red Hat is not aware of a practical temporary workaround that fully mitigates this issue or meets Red Hat Product Security's standards for usability, deployment, applicability, or stability. Customers are advised to apply the relevant security updates when they become available.