CVE-2026-7210
CRITICAL9.8EPSS 0.06%The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection
Published: 5/11/2026Modified: 5/16/2026
Description
`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.
Affected packages (9)
- Bitnami/libpythonfrom 0
- Bitnami/pythonfrom 0
- Bitnami/python-minfrom 0
- Debian/pypy3from 0
- Debian/python2.7from 0
- Debian/python3.11from 0
- Debian/python3.13from 0
- Debian/python3.14from 0
- Debian/python3.9from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/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 |
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
References (7)
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-7210
- WEBhttps://github.com/python/cpython/issues/149018
- WEBhttps://github.com/python/cpython/pull/149023
- WEBhttps://mail.python.org/archives/list/[email protected]/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/
- WEBhttps://nvd.nist.gov/vuln/detail/CVE-2026-7210
- WEBhttp://www.openwall.com/lists/oss-security/2026/05/11/13
- WEBhttp://www.openwall.com/lists/oss-security/2026/05/11/8