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Security Advisories

CVE-2026-6879

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-6879

Severity

Unknown
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Summary

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.

References

Affected packages


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