# CVE-2021-3121: gogoprotobuf: An issue was discovered in GoGo Protobuf before 1.3.2.plugin/unmarshal/unmarshal.go lacks certain index validation, a...

CVE-2021-3121 is fixed in 4 products on 1 platform, first by gogoprotobuf 1.3.2-1, released January 10, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-3121
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0343
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 10, 2021

## Description

An issue was discovered in GoGo Protobuf before 1.3.2.plugin/unmarshal/unmarshal.go lacks certain index validation, aka the"skippy peanut butter" issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gogoprotobuf Ubuntu 22.04.1 LTS (jammy) | 1.3.2-1 | [gogoprotobuf 1.3.2-1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gogoprotobuf-1.3.2-1.md) | Jan 10, 2021 |
| Linux | gogoprotobuf Ubuntu 24.10 (oracular) | 1.3.2-1 | [gogoprotobuf 1.3.2-1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-gogoprotobuf-1.3.2-1.md) | Jan 16, 2026 |
| Linux | gogoprotobuf Ubuntu 25.04 (plucky) | 1.3.2-1 | [gogoprotobuf 1.3.2-1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-gogoprotobuf-1.3.2-1.md) | Jan 16, 2026 |
| Linux | golang-github-gogo-protobuf-dev Ubuntu 22.04.1 LTS (jammy) | 1.3.2-1 | [golang-github-gogo-protobuf-dev 1.3.2-1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-golang-github-gogo-protobuf-dev-1.3.2-1.md) | Jan 10, 2021 |
| Linux | golang-gogoprotobuf-dev Ubuntu 22.04.1 LTS (jammy) | 1.3.2-1 | [golang-gogoprotobuf-dev 1.3.2-1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-golang-gogoprotobuf-dev-1.3.2-1.md) | Jan 10, 2021 |
| Linux | golang-gogoprotobuf-dev Ubuntu 24.10 (oracular) | 1.3.2-1 | [golang-gogoprotobuf-dev 1.3.2-1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-golang-gogoprotobuf-dev-1.3.2-1.md) | Jan 16, 2026 |
| Linux | golang-gogoprotobuf-dev Ubuntu 25.04 (plucky) | 1.3.2-1 | [golang-gogoprotobuf-dev 1.3.2-1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-golang-gogoprotobuf-dev-1.3.2-1.md) | Jan 16, 2026 |
| Linux | kubernetes1.18 opensuse-leap 15.6 | 1.18.20-150200.5.25.1 | [SUSE-SU-2025:02977-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02977-1.md) | Aug 25, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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