Vulnerability Database · PyPI · protobuf · Version
protobuf 4.23.0rc2
4.23.0rc2 is affected by 5 vulnerabilities.
The vulnerabilities that cover this exact version are listed below with the fixed version to move to. The upgrade Vulert recommends: 7.36.2.
Critical 0 High 5 Medium 0 Low 0 Unrated 0
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Released 28 Apr 2023
Licence BSD-3-Clause
Also known from other sources 4
Newer releases 222
Database updated 23/Oct/2026
Release and licence data published by PyPI. Licence information is not legal advice.
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01 Vulnerabilities affecting this version
protobuf 4.23.0rc2 vulnerabilities
5 vulnerabilities cover protobuf 4.23.0rc2. Open the full list in the database.
| Vulnerability | Severity | Fixed version | Disclosed |
|---|---|---|---|
| CVE-2015-5237: Protobuf Heap-Based Buffer Overflow Vulnerability | 8.8 high | No fix published | 25 Sep 2017 |
| CVE-2026-0994: Protobuf JSON Recursion Depth Bypass Vulnerability | 8.2 high | 5.29.6 | 07 Jul 2026 |
| CVE-2025-4565: protobuf Vulnerability Leading to Potential Denial of Service | 8.2 high | 4.25.8 | 07 Jul 2026 |
| CVE-2026-0994: Protobuf JSON Recursion Depth Bypass Vulnerability | 8.2 high | No fix published | 23 Jan 2026 |
| CVE-2025-4565: Denial of Service Vulnerability in Protobuf-Python | 8.2 high | 4.25.8 | 16 Jun 2025 |
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Questions
About protobuf 4.23.0rc2
Is protobuf 4.23.0rc2 vulnerable?
Yes. 5 vulnerabilities in the Vulert database cover protobuf 4.23.0rc2: 0 critical, 5 high, 0 medium and 0 low. The upgrade Vulert recommends is 7.36.2, and each entry above names the fixed version to move to.
Which version of protobuf should I use instead of 4.23.0rc2?
7.36.2 is the version Vulert recommends for this release line. The version table on the package page lists every release with the vulnerabilities recorded against it.
Is 4.23.0rc2 the latest release of protobuf?
No. 4.23.0rc2 was published 28 Apr 2023, and newer releases exist. Newer is not automatically safer — the version table on the package page shows what each release carries.
How do I monitor protobuf for upcoming vulnerabilities?
Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the protobuf version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.