CVE-2026-46385

HighCVSS 7.5

Published: 29/05/2026(UTC)Updated: 07/09/2026(UTC)Translated: 23/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.52%

43th percentile - higher than 43% of all known CVEs

Summary

The iskorotkov/avro library for Go before version 2.33.0 contains a remote denial-of-service (DoS) vulnerability. Avro block decoders do not check the reader's error state in the processing loop, allowing an attacker to send a packet with a huge number of elements, causing an infinite loop and CPU exhaustion.

Risk Assessment

An unauthenticated attacker can remotely pin a CPU core indefinitely, leading to denial of service for applications using this library.

Recommendation

Immediately update the iskorotkov/avro library to version 2.33.0 or later.

Other vulnerabilities in iskorotkov/avro

CVE-2026-46384High
The Go Avro library (iskorotkov/avro) before version 2.33.0 has multiple vulnerabilities in Avro decoders. An attacker can send attacker-controlled 64-bit values that on 32-bit platforms (GOARCH=386, arm, mips, wasm) bypass bounds checks, select wrong union branches, or cause OCF panic. Additionally, on all platforms there are cumulative-size arithmetic overflows in array/map decoders, math.MinInt negation in block headers, and make([]byte, size) with negative size in OCF blocks – all leading to panic or bypassing allocation limits.

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.