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Vulnerability record · CVE-2021-21289 · published 2 February 2021

CVE-2021-21289: Mechanize project mechanize os command injection vulnerability

Mechanize Project · Mechanize

Mechanize is an open-source ruby library that makes automated web interaction easy. In Mechanize from version 2.0.0 and before version 2.7.7 there is a command injection vulnerability. Affected versions of mechanize allow for OS commands to be injected using several classes' methods which implicitly use Ruby's Kernel.open method. Exploitation is possible only if untrusted input is used as a local filename and passed to any of these calls: Mechanize::CookieJar#load, Mechanize::CookieJar#save_as, Mechanize#download, Mechanize::Download#save, Mechanize::File#save, and Mechanize::FileResponse#read_body. This is fixed in version 2.7.7.

8.3 CVSS 3.1 High EPSS 3.5% · top 11.2% CWE-78 · OS command injection
8.3CVSS 3.1 base score, v2 7.6
3.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

Description

Mechanize is an open-source ruby library that makes automated web interaction easy. In Mechanize from version 2.0.0 and before version 2.7.7 there is a command injection vulnerability. Affected versions of mechanize allow for OS commands to be injected using several classes' methods which implicitly use Ruby's Kernel.open method. Exploitation is possible only if untrusted input is used as a local filename and passed to any of these calls: Mechanize::CookieJar#load, Mechanize::CookieJar#save_as, Mechanize#download, Mechanize::Download#save, Mechanize::File#save, and Mechanize::FileResponse#read_body. This is fixed in version 2.7.7.

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/sparklemotion/mechanize/commit/66a6a1bfa653a5f13274a396a5e5441238656aa0 PatchThird Party Advisory
https://github.com/sparklemotion/mechanize/releases/tag/v2.7.7 Release NotesThird Party Advisory
https://github.com/sparklemotion/mechanize/security/advisories/GHSA-qrqm-fpv6-6r8g Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00021.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LBVVJUL4P4KCJH4IQTHFZ4A
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YNFZ7ROYS6V4J5L5PRAJUG2
https://rubygems.org/gems/mechanize/ ProductThird Party Advisory
https://security.gentoo.org/glsa/202107-17 Third Party Advisory
https://github.com/sparklemotion/mechanize/commit/66a6a1bfa653a5f13274a396a5e5441238656aa0 PatchThird Party Advisory
https://github.com/sparklemotion/mechanize/releases/tag/v2.7.7 Release NotesThird Party Advisory
https://github.com/sparklemotion/mechanize/security/advisories/GHSA-qrqm-fpv6-6r8g Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00021.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LBVVJUL4P4KCJH4IQTHFZ4A
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YNFZ7ROYS6V4J5L5PRAJUG2
https://rubygems.org/gems/mechanize/ ProductThird Party Advisory
https://security.gentoo.org/glsa/202107-17 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-21289), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.