The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection
`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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-7210US | high7.5 | — | ||
`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\nFu… | ||||
02
references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2026/05/11/13ADVISORY
- http://www.openwall.com/lists/oss-security/2026/05/11/8ADVISORY
- https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4FIX
- https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566FIX
- https://github.com/python/cpython/commit/cbaecf9f16da611a646d507c1cbca265c588fc56WEB
- https://github.com/python/cpython/commit/e37df2a6a71d6538698e2d3188a7c345b827640bWEB
- https://github.com/python/cpython/commit/ea70712d1a8508e14e9677d44f838dab04dc0286WEB
- https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27aFIX
scry
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