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.
Weakness
An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Red Hat Hardened Images | RedHat | python3-14-main-3.14.6-2.2.hum1 | * |
| Red Hat Hardened Images | RedHat | python3-10-main-3.10.20-3.2.hum1 | * |
| Red Hat Hardened Images | RedHat | python3-11-main-3.11.15-5.5.hum1 | * |
| Red Hat Hardened Images | RedHat | python3-13-main-3.13.14-1.7.hum1 | * |
| Red Hat Hardened Images | RedHat | python3-12-main-3.12.13-3.8.hum1 | * |
| Red Hat Hardened Images | RedHat | python3-14-main-3.14.7-1.hum1 | * |
| Red Hat Hardened Images | RedHat | python3-13-main-3.13.15-1.hum1 | * |
References
- https://github.com/python/cpython/commit/02c08e6b747ac43d0d866a4ffa916bedf3423f81
- https://github.com/python/cpython/commit/037965c00a427cba5c05447efadc67c51a492e85
- https://github.com/python/cpython/commit/0583f24ae678993e3f7939f51ad5bcae5ad9dc70
- https://github.com/python/cpython/commit/2ffab083782968a4d732738f4f1dff6bbd69d2b0
- https://github.com/python/cpython/commit/390337b8ba1658833fdef379e1739c9f9533a8db
- https://github.com/python/cpython/commit/96510a3758f4a075f43223afdee3b6ee1a7a7f02
- https://github.com/python/cpython/commit/cb409342a19f25656f62e679f8bac265fe1442c3
- https://github.com/python/cpython/issues/152674
- https://github.com/python/cpython/pull/152676
- https://mail.python.org/archives/list/security-announce@python.org/thread/7YMZ6DDZVR26TJJBVO3RDNBAVGHNYAKR/