CVE-2022-2309: fedoraproject fedora NULL Pointer Dereference

Vulnerability summary

CVE-2022-2309 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in fedoraproject fedora. EPSS estimates a 2.45% chance of exploitation in the next 30 days, higher than 84.1% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 05-07-2022
   PublishedVulnerability first disclosed.
2. 04-11-2025
   Last modifiedVulnerability information updated.

Description

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.

• CWE-476NULL Pointer DereferenceThe product dereferences a pointer that it expects to be valid but is NULL.