{"id":"CVE-2021-43805","aliases":["GHSA-qxmr-qxh6-2cc9"],"url":"https://o3.security/vulnerability/CVE-2021-43805","summary":"ReDos vulnerability on guest checkout email validation","details":"Solidus is a free, open-source ecommerce platform built on Rails. Versions of Solidus prior to 3.1.4, 3.0.4, and 2.11.13 have a denial of service vulnerability that could be exploited during a guest checkout. The regular expression used to validate a guest order's email was subject to exponential backtracking through a fragment like `a.a.` Versions 3.1.4, 3.0.4, and 2.11.13 have been patched to use a different regular expression. The maintainers added a check for email addresses that are no longer valid that will print information about any affected orders that exist. If a prompt upgrade is not an option, a workaround is available. It is possible to edit the file `config/application.rb` manually (with code provided by the maintainers in the GitHub Security Advisory) to check email validity.","published":"2021-12-07T18:15:07.407Z","modified":"2026-07-09T10:52:42.583461Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"RubyGems","name":"solidus_core","fixedVersion":"2.11.13"},{"ecosystem":"RubyGems","name":"solidus_core","fixedVersion":"3.0.4"},{"ecosystem":"RubyGems","name":"solidus_core","fixedVersion":"3.1.4"}],"fix":{"url":"https://github.com/solidusio/solidus/commit/9867153e01e3c3b898cdbcedd7b43375ea922401","label":"solidusio/solidus@9867153"},"references":[{"type":"FIX","url":"https://github.com/solidusio/solidus/commit/9867153e01e3c3b898cdbcedd7b43375ea922401"},{"type":"EVIDENCE","url":"https://github.com/solidusio/solidus/security/advisories/GHSA-qxmr-qxh6-2cc9"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T10:52:42.583461Z"}}