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CVE-2026-46384

iskorotkov/avro: Integer Overflow in Avro Decoder PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
iskorotkov / avroaffected < 2.33.0

CWE

CWE-190

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

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.