iskorotkov avro prior 2.33.0 Decoder integer overflow

Summaryinfo

A vulnerability marked as problematic has been reported in iskorotkov avro. Affected by this vulnerability is an unknown functionality of the component Decoder. This manipulation causes integer overflow. This vulnerability is tracked as CVE-2026-46384. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in iskorotkov avro and classified as problematic. Affected by this vulnerability is an unknown code of the component Decoder. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect availability. The summary by CVE is:

iskorotkov/avro is a fast Go Avro codec. Prior to 2.33.0, several Avro decoder paths read attacker-controlled 64-bit values from the wire format and either narrowed them to platform-sized int before bounds-checking, or summed them with overflow-prone signed-int arithmetic. On 32-bit targets (GOARCH=386, arm, mips, wasm, etc.), the truncation paths can silently bypass byte-slice limits, select the wrong union branch, or hit the OCF negative-make panic via wrap. Three sub-issues are not 32-bit-specific: cumulative-size arithmetic overflow in arrayDecoder.Decode / mapDecoder.Decode / mapDecoderUnmarshaler.Decode (wraps at math.MaxInt64 on amd64 / arm64 and bypasses MaxSliceAllocSize / MaxMapAllocSize), math.MinInt negation in block-header handling, and make([]byte, size) with a negative size in OCF block reads — all three panic or bypass caps on any platform, giving an attacker a denial-of-service primitive there. This vulnerability is fixed in 2.33.0.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-46384. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 321121 (Linux Distros Unpatched Vulnerability : CVE-2026-46384), 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 (321121) and EUVD (EUVD-2026-33443). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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• iskorotkov

Name

• avro

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• 🔒

CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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