CVE-2026-46384: Iskorotkov Avro

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

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.

Affected products

  • Iskorotkov Avro: before 2.33.0 (fixed in 2.33.0)
  • Red Hat Cryostat 4 On Rhel 9: before 4.2.0-19 (fixed in 4.2.0-19)
  • Red Hat Multicluster Global Hub 1.4.5: before 1784060681 (fixed in 1784060681)
  • Red Hat Multicluster Global Hub 1.6.5: before 1784561376 (fixed in 1784561376)
  • Red Hat Multicluster Global Hub 1.7.0: before 1784906628 (fixed in 1784906628)
  • Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.11: before 1783578847 (fixed in 1783578847)
  • Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.13: before 1782383730 (fixed in 1782383730)
  • Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.16: before 1786908968 (fixed in 1786908968)
  • Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.17: before 1787316467 (fixed in 1787316467)
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Multicluster Global Hub 1.5.3: before 1784562060 (fixed in 1784562060)

Published 2026-05-29. Last modified 2026-09-09.