CVE-2026-6879
Quadratic Behavior in xml.etree.ElementPath Index Predicates
Description
`Element.findall()` and fully-consumed `Element.iterfind()` exhibit `O(n^2)` time complexity when using XPath index predicates (e.g. `[1]`, `[last()]`, `[last()-N]`) on XML documents with many same-tag siblings. `Element.find()` is only affected when the first match is near the end of the sibling list, such as with `[last()]` or `[last()-N]`; `.//item[1]` short-circuits after the first match.
No summary for this CVE yet.
Weaknesses
Affected Products
Python Software Foundation
oss-project·USaka psf
Exploitability
No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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MITRE ATT&CK
1 technique Impact
References
https://github.com/python/cpython/pull/152676
github.com
https://github.com/python/cpython/issues/152674
github.com
https://mail.python.org/archives/list/security-announce@python.org/thread/7YMZ6DDZVR26TJJBVO3RDNBAVGHNYAKR/
mail.python.org
and 7 more references View all →
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