CVE-2026-46385: CWE-400: Uncontrolled Resource Consumption in iskorotkov avro
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.
AI Analysis
Technical Summary
The iskorotkov/avro library before version 2.33.0 contains an uncontrolled resource consumption vulnerability (CWE-400) due to the array and map decoders looping over an attacker-controlled block-count without verifying read errors. This flaw allows an attacker to trigger excessive CPU usage remotely without authentication, resulting in a denial-of-service condition. The vulnerability is tracked as CVE-2026-46385 and has a CVSS 4.0 base score of 8.7 (high severity). The issue is resolved in version 2.33.0.
Potential Impact
An unauthenticated remote attacker can exploit this vulnerability to cause excessive CPU consumption on systems using affected versions of iskorotkov/avro, leading to denial-of-service by exhausting system resources.
Mitigation Recommendations
Upgrade iskorotkov/avro to version 2.33.0 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor advisory indicating the fix in 2.33.0. No other mitigations are specified.
CVE-2026-46385: CWE-400: Uncontrolled Resource Consumption in iskorotkov avro
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.
CVSS v4.0
Score 8.7high
Affected software
pkg:golang/github.com/iskorotkov/avroRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The iskorotkov/avro library before version 2.33.0 contains an uncontrolled resource consumption vulnerability (CWE-400) due to the array and map decoders looping over an attacker-controlled block-count without verifying read errors. This flaw allows an attacker to trigger excessive CPU usage remotely without authentication, resulting in a denial-of-service condition. The vulnerability is tracked as CVE-2026-46385 and has a CVSS 4.0 base score of 8.7 (high severity). The issue is resolved in version 2.33.0.
Potential Impact
An unauthenticated remote attacker can exploit this vulnerability to cause excessive CPU consumption on systems using affected versions of iskorotkov/avro, leading to denial-of-service by exhausting system resources.
Mitigation Recommendations
Upgrade iskorotkov/avro to version 2.33.0 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor advisory indicating the fix in 2.33.0. No other mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-13T19:53:47.922Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
- Gcve Source
- db.gcve.eu
Threat ID: 6a19feb2e29bf47b500fc2a0
Added to database: 05/29/2026, 21:01:38 UTC
Last enriched: 07/29/2026, 21:03:28 UTC
Last updated: 07/31/2026, 21:27:05 UTC
Views: 91
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