# CVE-2021-42762: Security feature bypass in n/a > A sandbox bypass in WebKitGTK allows a confined process to deceive host services about its sandbox status via VFS syscall abuse. - **Severity:** Medium 5.3 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 20 Oct 2021 - **Updated:** 4 Aug 2024 - **Also known as:** DEBIAN-CVE-2021-42762, GHSA-4ch5-gr7v-q6wq, SUSE-SU-2021:3603-1, SUSE-SU-2021:3768-1, UBUNTU-CVE-2021-42762, openSUSE-SU-2021:1454-1, openSUSE-SU-2021:3603-1 ## What is CVE-2021-42762? CVE-2021-42762 is a medium-severity vulnerability in Debian Debian Linux, published on 20 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description BubblewrapLauncher.cpp in WebKitGTK and WPE WebKit before 2.34.1 allows a limited sandbox bypass that allows a sandboxed process to trick host processes into thinking the sandboxed process is not confined by the sandbox, by abusing VFS syscalls that manipulate its filesystem namespace. The impact is limited to host services that create UNIX sockets that WebKit mounts inside its sandbox, and the sandboxed process remains otherwise confined. NOTE: this is similar to CVE-2021-41133. ## Which versions are affected by CVE-2021-42762? It affects 4 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `webkit2gtk3` | SUSE:HPE Helion OpenStack 8 | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 2.32.4-15.1 | | `webkit2gtk3` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 2.32.4-15.1 | | `webkit2gtk3` | SUSE:Linux Enterprise Module for Desktop Applications 15 SP2 | All versions | 2.32.4-15.1 | | `webkit2gtk3` | SUSE:Linux Enterprise Module for Desktop Applications 15 SP3 | All versions | 2.32.4-15.1 | | `webkit2gtk3` | SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:Linux Enterprise Server 12 SP3-BCL | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:Linux Enterprise Server 12 SP3-LTSS | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:Linux Enterprise Server 12 SP4-LTSS | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:Linux Enterprise Server for SAP Applications 12 SP4 | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:Linux Enterprise Software Development Kit 12 SP5 | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:OpenStack Cloud 8 | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:OpenStack Cloud 9 | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:OpenStack Cloud Crowbar 8 | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | SUSE:OpenStack Cloud Crowbar 9 | All versions | 2.32.4-2.74.5 | | `webkit2gtk3` | openSUSE:Leap 15.2 | All versions | 2.32.4-lp152.2.22.1 | | `webkit2gtk3` | openSUSE:Leap 15.3 | All versions | 2.32.4-15.1 | Products: Debian Debian Linux, Fedoraproject Fedora, Webkitgtk Webkitgtk, Wpewebkit Wpe Webkit. ## How do I fix CVE-2021-42762? Upgrade to a fixed version. ## Is CVE-2021-42762 being exploited? There is no known exploitation of CVE-2021-42762 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-2021-42762 and fix it if it is affected. What it is: CVE-2021-42762 is a medium-severity vulnerability in Debian Debian Linux, published on 20 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2021-42762 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-2021-42762/ (Markdown: https://insights.sbomify.com/CVE-2021-42762/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42762 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42762 - OSV: https://osv.dev/vulnerability/CVE-2021-42762 --- From sbomify Insights: https://insights.sbomify.com/CVE-2021-42762/ Summaries are generated and may contain mistakes; the official description above is the record.