PT-2026-39722 · Python · Cpython

Stan Ulbrych · Published 2026-05-11 · Updated 2026-05-11 · CVE-2026-7210

NVD

CVSS v4.0

6.3

Medium

Base vector

AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

xml.parsers.expat and xml.etree.ElementTree use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.r r Fully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.

Fix

Weakness Enumeration

CWE-331

Related Identifiers

CVE-2026-7210

Affected Products

Cpython

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-7210 · Security Note
• https://github.com/python/cpython/pull/149023 · Patch
• https://mail.python.org/archives/list/[e-mail]/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K · Vendor Advisory
• https://github.com/python/cpython/issues/149018 · Note