CVE-2021-3121

Publication date 11 January 2021

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
golang-gogoprotobuf	25.10 questing	Fixed 1.3.2-1
	25.04 plucky	Fixed 1.3.2-1
	24.10 oracular	Fixed 1.3.2-1
	24.04 LTS noble	Fixed 1.3.2-1
	23.10 mantic	Fixed 1.3.2-1
	23.04 lunar	Fixed 1.3.2-1
	22.10 kinetic	Fixed 1.3.2-1
	22.04 LTS jammy	Fixed 1.3.2-1
	21.10 impish	Fixed 1.3.2-1
	21.04 hirsute	Fixed 1.3.2-1
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Not in release

Notes

sbeattie

still need to sort which of all of the golang sources that build-depend on golang-gogoprotobuf-dev and golang-github-gogo-protobuf-dev need to be rebuilt. not sure how the 1.2.1 -> 1.3.0 transition plays out here, it may be that some build dependencies had not been built yet with 1.3 .pb.go files, and rebuilding them in hirsute might trigger that. See https://github.com/gogo/protobuf#release-v130 for discussion on potential compatibility issues

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
golang-gogoprotobuf	Upstream: b03c65e

Severity score breakdown

Parameter	Value
Base score	8.6 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	Low
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H