NULL Pointer Dereference allows malicious users to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 up to and including 2.9.14. libxml2 2.9.9 and previous versions are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
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lxml lxml |
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fedoraproject fedora 36 |
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fedoraproject fedora 37 |
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