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CVSS 9.83 sources verified·1 min read
By Lyrie Threat Intelligence·5/16/2026

CRITICAL: CVE-2026-7210 (CVSS 9.8) — libexpat project libexpat

CVE: CVE-2026-7210

CVSS: 9.8 (3.1) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: CRITICAL

Status: Critical advisory

Affected

  • libexpat project libexpat

Summary

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\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.

Verified Sources

References

  • https://github.com/python/cpython/issues/149018
  • https://github.com/python/cpython/pull/149023
  • https://mail.python.org/archives/list/[email protected]/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/
  • http://www.openwall.com/lists/oss-security/2026/05/11/13
  • http://www.openwall.com/lists/oss-security/2026/05/11/8

_Validated by the Lyrie Threat Intelligence Pipeline — 3 independent sources confirmed before publication. No speculation._

Lyrie Verdict

A vulnerability of this severity is exactly what Lyrie's anti-rogue-AI defense is built for: continuous, autonomous monitoring that doesn't wait for human reaction time.

#libexpat#critical

Validated sources

  1. [1]NVD
  2. [2]GitHub Advisory
  3. [3]MITRE

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