---
id: CVE-2026-93752
title: >-
  CSSOM through 0.5.0 contains a denial of service vulnerability in
  CSSStyleDeclaration.setProperty() that fails to validate reserved property
  names
summary: >-
  CSSOM through 0.5.0 contains a denial of service vulnerability in
  CSSStyleDeclaration.setProperty() that fails to validate reserved property
  names. Attackers can supply a stylesheet with a declaration named length to
  replace the internal…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-915
  - CWE-770
vendor: NV
product: CSSOM
affected:
  - CSSOM <= 0.5.0
published: '2026-09-18'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:25:55.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93752'
references:
  - url: 'https://github.com/NV/CSSOM'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/NV/CSSOM/blob/00ec21868e12422581c81779135c2f1648441204/lib/CSSStyleDeclaration.js#L112-L124
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/NV/CSSOM/blob/00ec21868e12422581c81779135c2f1648441204/lib/CSSStyleDeclaration.js#L41-L56
    label: disclosure@vulncheck.com
  - url: 'https://github.com/NV/CSSOM/issues/119'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/cssom-through-0.5.0-denial-of-service-via-length-property
    label: disclosure@vulncheck.com
  - url: 'https://github.com/NV/CSSOM/issues/119'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93752.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93752'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2538672'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93752'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93752'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
epss: 0.00469
epssPercentile: 0.39775
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-18T19:48:46.423602Z'
ingestedAt: '2026-09-18T18:47:53.269Z'
---

## Overview

CSSOM through 0.5.0 contains a denial of service vulnerability in CSSStyleDeclaration.setProperty() that fails to validate reserved property names. Attackers can supply a stylesheet with a declaration named length to replace the internal counter and trigger excessive memory allocation during cssText serialization, causing process termination.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93752.json)