Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-05-29T19:58:21 github.com/hamba/avro/v2: github.com/linkedin/goavro/v2: Integer Overflow in Avro Decoder 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CWE-190

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.

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). 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. Cryostat 4 Affected cryostat/cryostat-storage-rhel9 Multicluster Global Hub Affected multicluster-globalhub/multicluster-globalhub-grafana-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 Affected rhacm2/acm-grafana-rhel9 Red Hat Enterprise Linux 10 Affected grafana Red Hat Enterprise Linux 8 Affected grafana Red Hat Enterprise Linux 9 Affected grafana Red Hat Hardened Images Affected opentelemetry-collector-contrib https://www.cve.org/CVERecord?id=CVE-2026-46384 https://nvd.nist.gov/vuln/detail/CVE-2026-46384 https://github.com/iskorotkov/avro/security/advisories/GHSA-mc57-h6j3-3hmv