Quadratic Behavior in xml.etree.ElementPath Index Predicates
8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 2epss 0.3%
exploitation probability
0.3%top 78% of all CVEs
observed exploitation
nono source reports it
`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.
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Affected products
Python Software Foundation · CPythonReferences
https://github.com/python/cpython/commit/02c08e6b747ac43d0d866a4ffa916bedf3423f81https://github.com/python/cpython/commit/2ffab083782968a4d732738f4f1dff6bbd69d2b0https://github.com/python/cpython/commit/390337b8ba1658833fdef379e1739c9f9533a8dbhttps://github.com/python/cpython/commit/96510a3758f4a075f43223afdee3b6ee1a7a7f02https://github.com/python/cpython/commit/cb409342a19f25656f62e679f8bac265fe1442c3https://github.com/python/cpython/issues/152674https://github.com/python/cpython/pull/152676https://mail.python.org/archives/list/security-announce@python.org/thread/7YMZ6DDZVR26TJJBVO3RDNBAVGHNYAKR/