{"id":"CVE-2023-37475","aliases":["GHSA-9x44-9pgq-cf45","GO-2023-1930"],"url":"https://o3.security/vulnerability/CVE-2023-37475","summary":"Attacker-controlled parameter can cause denial of service in hamba avro","details":"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.","published":"2023-07-17T16:36:23.546Z","modified":"2026-07-15T01:49:15.335336121Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Go","name":"github.com/hamba/avro","fixedVersion":"2.13.0"},{"ecosystem":"Go","name":"github.com/hamba/avro/v2","fixedVersion":"2.13.0"}],"fix":{"url":"https://github.com/hamba/avro/commit/b4a402f41cf44b6094b5131286830ba9bb1eb290","label":"hamba/avro@b4a402f"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/37xxx/CVE-2023-37475.json"},{"type":"ADVISORY","url":"https://github.com/hamba/avro/security/advisories/GHSA-9x44-9pgq-cf45"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-37475"},{"type":"FIX","url":"https://github.com/hamba/avro/commit/b4a402f41cf44b6094b5131286830ba9bb1eb290"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:15.335336121Z"}}