# CVE-2020-18032: Memory corruption in n/a > Remote attackers can execute arbitrary code or crash the application by loading a crafted file into the Graphviz library. - **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Local or same network only - **Victim action needed:** A user has to click or open something - **Fix available:** Yes - **Published:** 29 Apr 2021 - **Updated:** 4 Aug 2024 - **Also known as:** ALPINE-CVE-2020-18032, ALSA-2021:4256, AZL-34767, AZL-6454, CLEANSTART-2026-IG79892, DEBIAN-CVE-2020-18032, DSA-4914-1, GHSA-92qh-4rf3-8x2m, MGASA-2021-0228, OESA-2021-1195, RHSA-2021:4256, RLSA-2021:4256, SUSE-SU-2021:1646-1, SUSE-SU-2021:1651-1, UBUNTU-CVE-2020-18032, openSUSE-SU-2021:0757-1, openSUSE-SU-2021:1651-1 ## What is CVE-2020-18032? CVE-2020-18032 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 29 Apr 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link. ### Official description Buffer Overflow in Graphviz Graph Visualization Tools from commit ID f8b9e035 and earlier allows remote attackers to execute arbitrary code or cause a denial of service (application crash) by loading a crafted file into the "lib/common/shapes.c" component. Weakness: CWE-120 (Buffer Copy without Checking Size of Input) ## Which versions are affected by CVE-2020-18032? It affects 3 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `graphviz` | AlmaLinux:8 | All versions | 2.40.1-43.el8 | | `graphviz-devel` | AlmaLinux:8 | All versions | 2.40.1-43.el8 | | `graphviz-doc` | AlmaLinux:8 | All versions | 2.40.1-43.el8 | | `graphviz-gd` | AlmaLinux:8 | All versions | 2.40.1-43.el8 | | `graphviz-python3` | AlmaLinux:8 | All versions | 2.40.1-43.el8 | | `graphviz` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.40.1-43.el8 | | `graphviz-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.40.1-43.el8 | | `graphviz-debugsource` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.40.1-43.el8 | | `graphviz-gd-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.40.1-43.el8 | | `graphviz-guile-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.40.1-43.el8 | | `graphviz-java-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.40.1-43.el8 | | `graphviz-lua-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.40.1-43.el8 | | `graphviz-ocaml-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.40.1-43.el8 | | `graphviz-perl-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.40.1-43.el8 | | `graphviz-python3-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.40.1-43.el8 | | `graphviz-ruby-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.40.1-43.el8 | | `graphviz-tcl-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.40.1-43.el8 | | `graphviz-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-debugsource` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-devel` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-doc` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-gd` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-gd-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-guile-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-java-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-lua-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-ocaml-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-perl-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-python3` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-python3-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-ruby-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz-tcl-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.40.1-43.el8 | | `graphviz` | Rocky Linux:8 | All versions | 0:2.40.1-43.el8 | | `graphviz` | SUSE:Enterprise Storage 6 | All versions | 2.40.1-6.9.1 | | `graphviz-addons` | SUSE:Enterprise Storage 6 | All versions | 2.40.1-6.9.1 | | `graphviz` | SUSE:HPE Helion OpenStack 8 | All versions | 2.28.0-29.6.1 | | `graphviz-plugins` | SUSE:HPE Helion OpenStack 8 | All versions | 2.28.0-29.6.1 | | `graphviz-plugins` | SUSE:Linux Enterprise High Availability Extension 12 SP3 | All versions | 2.28.0-29.6.1 | | `graphviz-plugins` | SUSE:Linux Enterprise High Availability Extension 12 SP4 | All versions | 2.28.0-29.6.1 | | `graphviz-plugins` | SUSE:Linux Enterprise High Availability Extension 12 SP5 | All versions | 2.28.0-29.6.1 | Products: Debian Debian Linux, Fedoraproject Fedora, Graphviz Graphviz. ## How do I fix CVE-2020-18032? Apply the vendor's patch. ## Is CVE-2020-18032 being exploited? There is no known exploitation of CVE-2020-18032 in the wild and no public exploit code. ## Other vulnerabilities in Debian Debian Linux - [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild) - [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild) - [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild) - [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild) - [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2020-18032 and fix it if it is affected. What it is: CVE-2020-18032 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 29 Apr 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link. Exploitation: There is no known exploitation of CVE-2020-18032 in the wild and no public exploit code. Affected product: Debian Debian Linux. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2020-18032/ (Markdown: https://insights.sbomify.com/CVE-2020-18032/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2020-18032 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-18032 - OSV: https://osv.dev/vulnerability/CVE-2020-18032 --- From sbomify Insights: https://insights.sbomify.com/CVE-2020-18032/ Summaries are generated and may contain mistakes; the official description above is the record.