# Regular Expression Denial of Service in Addressable templates

Advisory record · `GHSA-jxhc-q857-3j6g`

- **Identifiers:** `GHSA-jxhc-q857-3j6g` · `CVE-2021-32740`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html) · [CWE-1333](https://cwe.mitre.org/data/definitions/1333.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 12 Jul 2021
- **Updated:** 8 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 12 Jul 2021, 16:58 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `addressable` (RubyGems): affected `>=2.3.0, <2.8.0`; fixed in `2.8.0`

## 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:** 0.021, the 82nd percentile, on 10 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 12 Jul 2021. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-jxhc-q857-3j6g](https://github.com/advisories/GHSA-jxhc-q857-3j6g)
- [OSV: GHSA-jxhc-q857-3j6g](https://osv.dev/vulnerability/GHSA-jxhc-q857-3j6g)
- <https://github.com/sporkmonger/addressable/security/advisories/GHSA-jxhc-q857-3j6g>
- <https://nvd.nist.gov/vuln/detail/CVE-2021-32740>
- <https://github.com/sporkmonger/addressable/commit/0d8a3127e35886ce9284810a7f2438bff6b43cbc>
- <https://github.com/sporkmonger/addressable/commit/89c76130ce255c601f642a018cb5fb5a80e679a7>
- <https://github.com/sporkmonger/addressable/commit/92685096b1f7235ed8986c03ce30a24972eed848#diff-fb36d3dc67e6565ffde17e666a98697f48e76dac38fabf1bb9e97cdf3b583d76>
- <https://github.com/advisories/GHSA-jxhc-q857-3j6g>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/addressable/CVE-2021-32740.yml>
- <https://github.com/sporkmonger/addressable>
- <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SDFQM2NHNAZ3NNUQZEJTYECYZYXV4UDS>
- <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WYPVOOQU7UB277UUERJMCNQLRCXRCIQ5>

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-jxhc-q857-3j6g>, 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-jxhc-q857-3j6g/>. Everything for agents: <https://agentprime.io/llms.txt>.