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Fencer Intel
critical 9.8

CVE-2015-8857 json

Incorrect Handling of Non-Boolean Comparisons During Minification in uglify-js

published 9y ago modified 4mo ago also GHSA-34r7-q49f-h37c , EUVD-2017-0154

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.6%
EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm uglify-js 2.4.24
  • rubygems uglifier 2.7.2
  • uglifyjs_project uglifyjs 2.4.24
  • uglifyjs Debian 13 2.7.4-1

debian advisories DEBIAN-CVE-2015-8857

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-8857 updated cvss 2.6

uglify-js: Incorrect Handling of Non-Boolean Comparisons During Minification

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.56% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • nodesecurity.io https://nodesecurity.io/advisories/39 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
npm uglify-js
<2.4.24
2.4.24
rubygems uglifier
<2.7.2
2.7.2

Classification

Weakness
  • CWE-254 7PK - Security Features
  • CWE-1254 Incorrect Comparison Logic Granularity
  • CWE-670 Always-Incorrect Control Flow Implementation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.