iskorotkov avro prior 2.33.0 resource consumption

Summaryinfo

A vulnerability labeled as problematic has been found in iskorotkov avro. Affected is an unknown function. The manipulation results in resource consumption. This vulnerability is identified as CVE-2026-46385. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in iskorotkov avro. Affected is an unknown part. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-46385. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 321118 (Linux Distros Unpatched Vulnerability : CVE-2026-46385), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.33.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (321118) and EUVD (EUVD-2026-33444). Once again VulDB remains the best source for vulnerability data.

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Vendor

• iskorotkov

Name

• avro

CPE 2.3info

• 🔒

CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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