# ReDos vulnerability on guest checkout email validation

Advisory record · `GHSA-qxmr-qxh6-2cc9`

- **Identifiers:** `GHSA-qxmr-qxh6-2cc9` · `CVE-2021-43805`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-1333](https://cwe.mitre.org/data/definitions/1333.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 7 Dec 2021
- **Updated:** 8 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 7 Dec 2021, 22:01 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `solidus_core` (RubyGems): affected `<2.11.13 || >=3.0.0, <3.0.4 || >=3.1.0, <3.1.4`; fixed in `2.11.13`, `3.0.4`, `3.1.4`

## 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

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.014, the 73rd percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 7 Dec 2021. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-qxmr-qxh6-2cc9](https://github.com/advisories/GHSA-qxmr-qxh6-2cc9)
- [OSV: GHSA-qxmr-qxh6-2cc9](https://osv.dev/vulnerability/GHSA-qxmr-qxh6-2cc9)
- <https://github.com/solidusio/solidus/security/advisories/GHSA-qxmr-qxh6-2cc9>
- <https://nvd.nist.gov/vuln/detail/CVE-2021-43805>
- <https://github.com/solidusio/solidus/commit/6be174c955fad84017ca67589c676526bc5ade71>
- <https://github.com/solidusio/solidus/commit/9867153e01e3c3b898cdbcedd7b43375ea922401>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/solidus_core/CVE-2021-43805.yml>
- <https://github.com/solidusio/solidus>

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 (<https://api.agentprime.io/mcp>), 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: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-qxmr-qxh6-2cc9>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-qxmr-qxh6-2cc9/>. Everything for agents: <https://agentprime.io/llms.txt>.