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CVE-2026-46385— iskorotkov/avro: CPU Exhaustion 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之前版本存在资源管理错误漏洞，该漏洞源于Avro数组和映射解码器循环处理攻击者控制的块计数而不检查底层读取器错误状态，可能导致远程未经验证的拒绝服务。

CVSS 8.7 · High EPSS 0.52% · P42

Affected Version Matrix 1

VendorProduct Version RangeStatus
iskorotkov avro < 2.33.0 affected
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I. Basic Information for CVE-2026-46385

Vulnerability Information
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Vulnerability Title
iskorotkov/avro: CPU Exhaustion in Avro Decoder
Source: CVE Program / CVE List V5
Vulnerability Description
iskorotkov/avro is a fast Go Avro codec. Prior to 2.33.0, the Avro array and map decoders looped over an attacker-controlled block-count value without checking the underlying reader's error state inside the loop body. Reader.ReadBlockHeader returns the count as a Go int, which is 64-bit on amd64 / arm64 targets — so a producer can declare a block of up to math.MaxInt64 (~9.2 × 10¹⁸) elements followed by EOF (or any truncated payload), and the decoder will attempt that many no-op iterations before propagating the error. The realistic ceiling is "indefinite until the worker is killed externally" — a single hostile payload pins a CPU core until the process is OOM-killed, deadline-cancelled, or terminated. Remote, unauthenticated denial-of-service. 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
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Avro 资源管理错误漏洞
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之前版本存在资源管理错误漏洞，该漏洞源于Avro数组和映射解码器循环处理攻击者控制的块计数而不检查底层读取器错误状态，可能导致远程未经验证的拒绝服务。
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-2026-46385

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9950 chars
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III. Intelligence Information for CVE-2026-46385

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Vendor Advisories for CVE-2026-46385 (1)

IV. Related Vulnerabilities

Same product: avro
Same vendor: iskorotkov
Same weakness: CWE-400

V. Comments for CVE-2026-46385

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