lxml NULL Pointer Dereference allows attackers to cause a denial of service
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.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | lxml | < 4.9.1 | 4.9.1 |
Referencias
- https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba
- https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f
- https://github.com/advisories/GHSA-wrxv-2j5q-m38w
- https://nvd.nist.gov/vuln/detail/CVE-2022-2309
- https://github.com/lxml/lxml
- https://github.com/lxml/lxml/blob/master/CHANGES.txt
- https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2022-230.yaml
- https://lists.debian.org/debian-lts-announce/2024/09/msg00021.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGYC6L7ENH5VEGN3YWFBYMGKX6WNS7HZ
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/URHHSIBTPTALXMECRLAC2EVDNAFSR5NO
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HGYC6L7ENH5VEGN3YWFBYMGKX6WNS7HZ
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/URHHSIBTPTALXMECRLAC2EVDNAFSR5NO
- https://security.gentoo.org/glsa/202208-06
- https://security.netapp.com/advisory/ntap-20220915-0006
- Vector CVSS
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L- Debilidad (CWE)
CWE-476- Plataforma
- Python (PyPI)
- Paquete
lxml- Publicada
- 05.07.2022
- Actualizado
- 11.10.2026 12:19
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2022-230 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-wrxv-2j5q-m38w - CC BY 4.0
Historial de vulnerabilidades: lxml
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 7
- Primera → última
- 05.2014 04.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 1
- Media 6
Divulgaciones por año
- 2017: 0
- 2018: 1
- 2019: 0
- 2020: 1
- 2021: 2
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 1
antes: 1
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