--- id: CVE-2026-46384 title: iskorotkov/avro is a fast Go Avro codec summary: >- 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 o… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-190 vendor: iskorotkov product: avro affected: - avro < 2.33.0 patched: - cryostat_4_on_rhel 9 - multicluster_global_hub 1.4.5 - multicluster_global_hub 1.6.5 - multicluster_global_hub 1.7.0 - advanced_cluster_management_for_kubernetes 2.11 - advanced_cluster_management_for_kubernetes 2.13 - advanced_cluster_management_for_kubernetes 2.16 - advanced_cluster_management_for_kubernetes 2.17 - multicluster_global_hub 1.5.3 published: '2026-05-29' updated: '2026-09-09' sourceUpdated: '2026-09-09T13:20:17.007' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-46384' references: - url: 'https://github.com/iskorotkov/avro/security/advisories/GHSA-mc57-h6j3-3hmv' label: security-advisories@github.com - url: 'https://access.redhat.com/errata/RHSA-2026:30651' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:41030' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:41064' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:42852' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:44622' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:47149' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:48151' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:53530' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:57191' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:60386' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-46384' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2483482' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46384.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://www.cve.org/CVERecord?id=CVE-2026-46384' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-46384' tags: - nvd - cve.org - csaf - vex - red-hat ssvc: exploitation: none automatable: 'yes' technicalImpact: partial timestamp: '2026-05-29T21:35:10.446724Z' scores: nvd: 7.5 cna: 8.7 vendor: 7.5 epss: 0.00549 epssPercentile: 0.4487 ingestedAt: '2026-07-14T12:36:48.229Z' --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:48151** · Red Hat · fixed in: Cryostat 4 on RHEL 9 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:48151) - **RHSA-2026:41030** · Red Hat · fixed in: Multicluster Global Hub 1.4.5 · released 2026-07-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:41030) - **RHSA-2026:44622** · Red Hat · fixed in: Multicluster Global Hub 1.6.5 · released 2026-07-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:44622) - **RHSA-2026:47149** · Red Hat · fixed in: Multicluster Global Hub 1.7.0 · released 2026-07-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:47149) - **RHSA-2026:53530** · Red Hat · fixed in: Multicluster Global Hub 1.7.0 · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53530) - **RHSA-2026:41064** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.11 · released 2026-07-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:41064) - **RHSA-2026:30651** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.13 · released 2026-06-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:30651) - **RHSA-2026:57191** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.16 · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:57191) - **RHSA-2026:60386** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.17 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60386) - **RHSA-2026:42852** · Red Hat · fixed in: Red Hat multicluster global hub 1.5.3 · released 2026-07-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:42852) - **Red Hat VEX** · Important · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46384.json)