CVE-2026-81722

Katalog CVE

CVSS 7.5 · High EPSS 0,52%

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

Deskripsi (NVD)

nltk PorterStemmer in versions <= 3.10.2 (fixed in 3.10.3) contains an inefficient-algorithmic-complexity denial of service in PorterStemmer.stem(). The _is_consonant() helper walks backward over the entire run of trailing 'y' characters on every call, and _measure() invokes it for each stem position, causing O(n^2) behavior. A single ~20-50 KB untrusted token consisting of a long run of the letter 'y' followed by a matching suffix (e.g., 'ness') can pin a CPU core for seconds to minutes, causing availability impact.

Rincian

Terbit di NVD

27 Agustus 2026

Terakhir diubah

31 Agustus 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)

0,52% peluang dieksploitasi; lebih tinggi dari 42,6% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/nltk/nltk/security/advisories/GHSA-ww6m-cw3f-q94g exploit · advisory vendor
• https://www.vulncheck.com/advisories/nltk-porterstemmer-before-3.10.3-quadratic-time-dos advisory pihak ketiga