CVE-2026-7210The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection
Updated under an hour ago ()
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It affects Python Software Foundation CPython and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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`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.
- CVSS
- 6.3 MEDIUM (v4.0, CNA)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
- Weakness (CWE)
- CWE-331
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- PSF
- NVD analysis
- Modified
- Record last updated
- Oct 1, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Python Software Foundation CPython python_software_foundation:cpython (from the name) | before 3.10.22; from 3.11.0 before 3.11.16; from 3.12.0 before 3.12.14; from 3.13.0 before 3.13.14; from 3.14.0 before 3.14.6; from 3.15.0a1 before 3.15.0b2 | CNA record |
python python python:python | before 3.13.14; from 3.14.0 before 3.14.6; 3.15.0; 3.15.0; 3.15.0; 3.15.0; 3.15.0; 3.15.0; and 3 more ranges | NVD |
References
- https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/vendor-advisory, mailing-list, third-party-advisory
- https://github.com/python/cpython/pull/149023patch, issue-tracking
- https://github.com/python/cpython/issues/149018issue-tracking
- https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4patch
- https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566patch
- https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27apatch
- https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145fpatch
- https://github.com/python/cpython/commit/e37df2a6a71d6538698e2d3188a7c345b827640bpatch
- https://github.com/python/cpython/commit/cbaecf9f16da611a646d507c1cbca265c588fc56patch
- https://github.com/python/cpython/commit/ea70712d1a8508e14e9677d44f838dab04dc0286patch
- http://www.openwall.com/lists/oss-security/2026/05/11/13mailing-list, third-party-advisory
- http://www.openwall.com/lists/oss-security/2026/05/11/8mailing-list, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.