---
id: CVE-2021-46195
title: >-
  GCC v12.0 was discovered to contain an uncontrolled recursion via the
  component libiberty/rust-demangle.c
summary: >-
  GCC v12.0 was discovered to contain an uncontrolled recursion via the
  component libiberty/rust-demangle.c. This vulnerability allows attackers to
  cause a Denial of Service (DoS) by consuming excessive CPU and memory
  resources.
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'
cwe:
  - CWE-674
vendor: gnu
product: gcc
affected:
  - gcc = 12.0
patched:
  - codeready_linux_builder_v_9
published: '2022-01-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:17:12.637'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-46195'
references:
  - url: 'https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103841'
    label: cve@mitre.org
  - url: 'https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103841'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-46195.json
  - url: 'https://access.redhat.com/security/cve/CVE-2021-46195'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2046300'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2021-46195'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2021-46195'
  - url: 'https://access.redhat.com/errata/RHSA-2022:8415'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00798
epssPercentile: 0.56332
scores:
  nvd: 5.5
  vendor: 3.3
ingestedAt: '2026-10-08T23:16:47.329Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-08T21:11:37.947276Z'
---

## Overview

GCC v12.0 was discovered to contain an uncontrolled recursion via the component libiberty/rust-demangle.c. This vulnerability allows attackers to cause a Denial of Service (DoS) by consuming excessive CPU and memory resources.

## Affected

- `gcc = 12.0`

## Remediation

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

## Vendor advisories

- **RHSA-2022:8415** · Red Hat · fixed in: Red Hat CodeReady Linux Builder (v. 9) · released 2022-11-15 · [advisory](https://access.redhat.com/errata/RHSA-2022:8415)
- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, … · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-46195.json)