CVE-2022-2309

NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier 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.

Affected products

Alt Linux, Almalinux, Debian, Linuxmint, Red Hat, Red Os, Rocky Linux, Suse

Lxml

< 4.9.1

Fix

Available

CVSS 3.1

7.5 HIGH

EPSS

2.5% (83th percentile)

Weakness

CWE-476

NVD status

Modified

Published

2022-07-05

No exploit for CVE-2022-2309 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.