# Command Injection Vulnerability in Mechanize Advisory record · `GHSA-qrqm-fpv6-6r8g` - **Identifiers:** `GHSA-qrqm-fpv6-6r8g` · `CVE-2021-21289` - **State:** Confirmed - **Severity:** CVSS 7.4 High - **Critical:** No - **Weakness (CWE):** [CWE-78](https://cwe.mitre.org/data/definitions/78.html) - **Tags:** [Command injection](https://agentprime.io/advisories/tag/command-injection.md) - **Published:** 2 Feb 2021 - **Updated:** 10 Sept 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 2 Feb 2021, 18:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `mechanize` (RubyGems): affected `>=2.0.0, <2.7.7`; fixed in `2.7.7` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Mechanize versions 2.0.0 up to but not including 2.7.7 are vulnerable to OS command injection through several methods that use Ruby's Kernel.open, such as CookieJar#load, Mechanize#download, and File#save. An attacker can exploit this only when untrusted input is passed as a local filename to these calls, allowing them to run operating system commands. Upgrade to Mechanize 2.7.7 or later; the advisory lists no workarounds. Written 8 Nov 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 7.4 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N`, from CNA (GitHub_M) - **CISA KEV:** Not listed. - **EPSS:** 0.035, the 89th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 15:16 UTC: First seen by agentprime - 31 Oct 2026, 15:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-qrqm-fpv6-6r8g) ## Sources - [GitHub Advisory Database: GHSA-qrqm-fpv6-6r8g](https://github.com/advisories/GHSA-qrqm-fpv6-6r8g) - [OSV: GHSA-qrqm-fpv6-6r8g](https://osv.dev/vulnerability/GHSA-qrqm-fpv6-6r8g) - - - - - - - - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .