CVE Watch20 ago 2026

CVE-2026-66046

Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xml

CVSS

7.5

Alto

EPSS

0.7%

p49

KEV

—

Exploit Today

0-100

Publicado: 18 ago 2026 · Última mod.: 20 ago 2026 · CWE-407

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an O(N^2) linear scan of elementType->defaultAtts to determine CDATA status. A remote unauthenticated attacker can supply a single well-formed XML document of a few megabytes to an application parsing untrusted XML to cause excessive CPU consumption, resulting in denial of service without requiring authentication, external entity resolution, or non-default parser options.

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