---
id: CVE-2022-33070
title: >-
  Protobuf-c v1.4.0 was discovered to contain an invalid arithmetic shift via
  the function parse_tag_and_wiretype in protobuf-c/protobuf-c.c
summary: >-
  Protobuf-c v1.4.0 was discovered to contain an invalid arithmetic shift via
  the function parse_tag_and_wiretype in protobuf-c/protobuf-c.c. This
  vulnerability allows attackers to cause a Denial of Service (DoS) via
  unspecified vectors.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
vendor: protobuf-c_project
product: protobuf-c
affected:
  - protobuf-c = 1.4.0
  - fedora = 36
published: '2022-06-23'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T21:17:48.770'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-33070'
references:
  - url: 'https://github.com/protobuf-c/protobuf-c/issues/506'
    label: cve@mitre.org
  - url: 'https://github.com/protobuf-c/protobuf-c/pull/508'
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFN2GHUEGTSHRD7J5PKQ5DRSJSEQ2IKN/
    label: cve@mitre.org
  - url: 'https://github.com/protobuf-c/protobuf-c/issues/506'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/protobuf-c/protobuf-c/pull/508'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFN2GHUEGTSHRD7J5PKQ5DRSJSEQ2IKN/
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01115
epssPercentile: 0.65024
ingestedAt: '2026-10-08T22:11:53.753Z'
---

## Overview

Protobuf-c v1.4.0 was discovered to contain an invalid arithmetic shift via the function parse_tag_and_wiretype in protobuf-c/protobuf-c.c. This vulnerability allows attackers to cause a Denial of Service (DoS) via unspecified vectors.

## Affected

- `protobuf-c = 1.4.0`
- `fedora = 36`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.