CVE-2026-46385
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk30th percentile - higher than 30% of all known CVEs
Summary
A remote denial-of-service (DoS) vulnerability was found in the iskorotkov/avro Go library. Array and map decoders loop indefinitely over an attacker-controlled block count without checking the reader's error state, allowing a malicious payload to pin a CPU core until the process is killed.
Risk Assessment
The organization is at risk of a DoS attack that can crash applications using the vulnerable library. The attack is unauthenticated and remote, leading to resource exhaustion (CPU, memory) and service disruption.
Recommendation
Immediately upgrade the iskorotkov/avro library to version 2.33.0 or later, which contains the fix for this vulnerability.
Original NVD description (English source)
iskorotkov/avro is a fast Go Avro codec. Prior to 2.33.0, the Avro array and map decoders looped over an attacker-controlled block-count value without checking the underlying reader's error state inside the loop body. Reader.ReadBlockHeader returns the count as a Go int, which is 64-bit on amd64 / arm64 targets — so a producer can declare a block of up to math.MaxInt64 (~9.2 × 10¹⁸) elements followed by EOF (or any truncated payload), and the decoder will attempt that many no-op iterations before propagating the error. The realistic ceiling is "indefinite until the worker is killed externally" — a single hostile payload pins a CPU core until the process is OOM-killed, deadline-cancelled, or terminated. Remote, unauthenticated denial-of-service. This vulnerability is fixed in 2.33.0.