GHSA-qxmr-qxh6-2cc9 · Severity: high · Ecosystem: rubygems — ReDos vulnerability on guest checkout email validation
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 The maintainers added a check for email addresses that are no longer valid that will print information about any affected orders that exist.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.
Conclusion & alert: CVE-2021-43805 is rated High Exploit Risk (70.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.40%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.29% over the last day, indicating growing attacker interest. Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.12% | 1.40% | +1.29% |
| 2 | 2025-11-21 | 0.35% | 0.12% | -0.24% |
| 3 | 2025-11-18 | — | 0.35% | — |
Full EPSS history (8 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
GHSA-qxmr-qxh6-2cc9 · Severity: high · Ecosystem: rubygems — ReDos vulnerability on guest checkout email validation
| URL | Tags |
|---|---|
| https://github.com/solidusio/solidus/commit/9867153e01e3c3b898cdbcedd7b43375ea922401 | Patch Third Party Advisory |
| https://github.com/solidusio/solidus/security/advisories/GHSA-qxmr-qxh6-2cc9 | Exploit Mitigation Third Party Advisory |