Bug 2538672 (CVE-2026-93752)

Summary: CVE-2026-93752 CSSOM: CSSOM: Denial of Service due to improper property name validation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in CSSOM. This vulnerability allows a remote attacker to trigger a denial of service by providing a specially crafted stylesheet. The issue stems from improper validation of reserved property names within the `CSSStyleDeclaration.setProperty()` function. Exploiting this, an attacker can cause excessive memory allocation during CSS text serialization, leading to the termination of the affected process.
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Description OSIDB Bzimport 2026-09-22 20:01:01 UTC 
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.