CVE-2026-66046

Katalog CVE

CVSS 7.5 · High EPSS 0,74%

Kerentanan Inefficient Algorithmic Complexity pada libexpat project libexpat. Skor CVSS 3.1 7.5 (High) menurut vulncheck.com.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

18 Agustus 2026

Terakhir diubah

18 September 2026

Status NVD

Analyzed

CVSS 3.1

7.5 (High), sumber vulncheck.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-407: Inefficient Algorithmic Complexity

EPSS (30 hari)

0,74% peluang dieksploitasi; lebih tinggi dari 53,4% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/libexpat/libexpat/pull/1321 exploit · patch · advisory vendor
• https://www.vulncheck.com/advisories/expat-denial-of-service-via-storeatts-quadratic-complexity exploit · patch · advisory pihak ketiga