# Shescape: Quadratic-time denial of service in the flag-protection

Advisory record · `GHSA-gm3r-q2wp-hw87`

- **Identifiers:** `GHSA-gm3r-q2wp-hw87` · `CVE-2026-73413`
- **State:** Confirmed
- **Severity:** CVSS 8.7 High
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html) · [CWE-407](https://cwe.mitre.org/data/definitions/407.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 24 Jul 2026
- **Updated:** 12 Aug 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 24 Jul 2026, 22:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `shescape` (npm): affected `>=2.1.11, <2.1.14 || >=3.0.0, <3.0.1`; fixed in `2.1.14`, `3.0.1`

## 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

- 8.7 High, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0059, the 48th percentile, on 14 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 24 Jul 2026. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-gm3r-q2wp-hw87](https://github.com/advisories/GHSA-gm3r-q2wp-hw87)
- [OSV: GHSA-gm3r-q2wp-hw87](https://osv.dev/vulnerability/GHSA-gm3r-q2wp-hw87)
- <https://github.com/ericcornelissen/shescape/security/advisories/GHSA-gm3r-q2wp-hw87>
- <https://github.com/ericcornelissen/shescape/pull/2649>
- <https://github.com/ericcornelissen/shescape/pull/2651>
- <https://github.com/ericcornelissen/shescape/commit/43d70b59d09bbe5c3fd02ef08b3a123e977ed9de>
- <https://github.com/ericcornelissen/shescape/commit/b4b34c394e7f9da2775bb75381066b9a228c425f>
- <https://github.com/ericcornelissen/shescape>
- <https://github.com/ericcornelissen/shescape/blob/dea8893a5877893d8d4923dbf253080e08899e6d/docs/migration.md>
- <https://github.com/ericcornelissen/shescape/releases/tag/v2.1.14>
- <https://github.com/ericcornelissen/shescape/releases/tag/v3.0.1>

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-gm3r-q2wp-hw87>, 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-gm3r-q2wp-hw87/>. Everything for agents: <https://agentprime.io/llms.txt>.