CVE-2023-37475

Hamba avro is a go lang encoder/decoder implementation of the avro codec specification. In affected versions a well-crafted string passed to avro's `github.com/hamba/avro/v2.Unmarshal()` can throw a `fatal error: runtime: out of memory` which is unrecoverable and can cause denial of service of the consumer of avro. The root cause of the issue is that avro uses part of the input to `Unmarshal()` to determine the size when creating a new slice and hence an attacker may consume arbitrary amounts of memory which in turn may cause the application to crash. This issue has been addressed in commit `b4a402f4` which has been included in release version `2.13.0`. Users are advised to upgrade. There are no known workarounds for this vulnerability.

• CWE-400

• https://github.com/hamba/avro/commit/b4a402f41cf44b6094b5131286830ba9bb1eb290Patch
• https://github.com/hamba/avro/security/advisories/GHSA-9x44-9pgq-cf45Exploit, Vendor Advisory
• https://github.com/hamba/avro/commit/b4a402f41cf44b6094b5131286830ba9bb1eb290Patch
• https://github.com/hamba/avro/security/advisories/GHSA-9x44-9pgq-cf45Exploit, Vendor Advisory

Published

Jul 17, 2023

Last Modified

Jun 17, 2026

Status

Modified

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