# brace-expansion: DoS via uncontrolled recursion on nested brace groups causing stack exhaustion

Advisory record · `GHSA-qhr7-859c-m2p7`

- **Identifiers:** `GHSA-qhr7-859c-m2p7` · `CVE-2026-102278`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html) · [CWE-674](https://cwe.mitre.org/data/definitions/674.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 29 Sept 2026
- **Updated:** 30 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 29 Sept 2026, 23:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `brace-expansion` (npm): affected `>=4.0.0, <5.0.11 || >=3.0.0, <3.0.8 || >=2.0.0, <2.1.6 || <1.1.20`; fixed in `5.0.11`, `3.0.8`, `2.1.6`, `1.1.20`

## 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:** 0.0049, the 42nd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 13:34 UTC: First seen by agentprime
- 31 Oct 2026, 13:34 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-qhr7-859c-m2p7)

## Sources

- [GitHub Advisory Database: GHSA-qhr7-859c-m2p7](https://github.com/advisories/GHSA-qhr7-859c-m2p7)
- [OSV: GHSA-qhr7-859c-m2p7](https://osv.dev/vulnerability/GHSA-qhr7-859c-m2p7)
- <https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-qhr7-859c-m2p7>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-102278>
- <https://github.com/juliangruber/brace-expansion/commit/1efee7c397c191da6287a78ec19512476a966a7b>
- <https://github.com/juliangruber/brace-expansion/commit/935d78f32f335b2ff76578e5c5e877d31ae9888c>
- <https://github.com/juliangruber/brace-expansion/commit/de84f144e9816f30e25fc8179e2e1249ab6df0db>
- <https://github.com/juliangruber/brace-expansion>

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-qhr7-859c-m2p7>, 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-qhr7-859c-m2p7/>. Everything for agents: <https://agentprime.io/llms.txt>.