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CVE-2026-46384— iskorotkov/avro: Integer Overflow in Avro Decoder

Quick assessment

Affected
iskorotkov avro
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Avro是hamba开源的一个快速 Go Avro 编解码器。 Avro 2.33.0之前版本存在输入验证错误漏洞，该漏洞源于多个Avro解码器路径读取攻击者控制的64位值并在边界检查前截断或使用溢出有符号整数算术求和，可能导致拒绝服务。

CVSS 8.7 · High EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
iskorotkov avro < 2.33.0 affected
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I. Basic Information for CVE-2026-46384

Vulnerability Information
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Vulnerability Title
iskorotkov/avro: Integer Overflow in Avro Decoder
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
Avro 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Avro是hamba开源的一个快速 Go Avro 编解码器。 Avro 2.33.0之前版本存在输入验证错误漏洞，该漏洞源于多个Avro解码器路径读取攻击者控制的64位值并在边界检查前截断或使用溢出有符号整数算术求和，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
iskorotkov avro < 2.33.0 -

II. Public POCs for CVE-2026-46384

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8582 chars
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III. Intelligence Information for CVE-2026-46384

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Vendor Advisories for CVE-2026-46384 (1)

IV. Related Vulnerabilities

Same product: avro
Same vendor: iskorotkov
Same weakness: CWE-190

V. Comments for CVE-2026-46384

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