CSSOM through 0.5.0 Denial of Service via length Property

Advisories

CSSOM through 0.5.0 Denial of Service via length Property

severity: high
date: 9/18/2026
Affecting: CSSOM <= 0.5.0
CVE: CVE-2026-93752
CWE: CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes
CVSS: 8.7
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References: GitHub Issue #119
https://github.com/NV/CSSOM
setProperty() writing a declaration name over the internal length field
cssText getter using the replaced counter as an array bound
Credit: Wayde Shi (PayPal Cyber Security Team)
Description: 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.

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