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.
Metrics
Affected Vendors & Products
Advisories
| Source | ID | Title |
|---|---|---|
Debian DLA |
DLA-3878-1 | libxml2 security update |
EUVD |
EUVD-2022-0148 | 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. |
Github GHSA |
GHSA-wrxv-2j5q-m38w | lxml NULL Pointer Dereference allows attackers to cause a denial of service |
Ubuntu USN |
USN-5760-1 | libxml2 vulnerabilities |
Ubuntu USN |
USN-6028-2 | libxml2 vulnerabilities |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Tue, 04 Nov 2025 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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Status: PUBLISHED
Assigner: @huntrdev
Published:
Updated: 2025-11-04T16:09:31.952Z
Reserved: 2022-07-05T00:00:00.000Z
Link: CVE-2022-2309
No data.
Status : Modified
Published: 2022-07-05T10:15:08.763
Modified: 2025-11-04T16:15:49.557
Link: CVE-2022-2309
OpenCVE Enrichment
No data.
Debian DLA
EUVD
Github GHSA
Ubuntu USN