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.

• CWE-476

• https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6fPatch, Third Party Advisory
• https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105baExploit, Issue Tracking, Patch, Third Party Advisory
• 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://security.gentoo.org/glsa/202208-06Third Party Advisory
• https://security.netapp.com/advisory/ntap-20220915-0006/Third Party Advisory
• https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6fPatch, Third Party Advisory
• https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105baExploit, Issue Tracking, Patch, Third Party Advisory
• 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://security.gentoo.org/glsa/202208-06Third Party Advisory
• https://security.netapp.com/advisory/ntap-20220915-0006/Third Party Advisory

Published

Jul 5, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2022-23084The total size of the user-provided nmreq to nmreq_copyin() …7.5
• CVE-2022-23085A user-provided integer option was passed to nmreq_copyin() …8.2
• CVE-2022-23086Handlers for *_CFG_PAGE read / write ioctls in the mpr, mps,…7.8
• CVE-2022-23087The e1000 network adapters permit a variety of modifications…8.8
• CVE-2022-23088The 802.11 beacon handling routine failed to validate the le…9.8
• CVE-2022-23089When dumping core and saving process information, proc_getar…4.7
• CVE-2022-23090The aio_aqueue function, used by the lio_listio system call,…7.7
• CVE-2022-23091A particular case of memory sharing is mishandled in the vir…4
• CVE-2022-23092The implementation of lib9p's handling of RWALK messages was…8.8
• CVE-2022-23093ping reads raw IP packets from the network to process respon…6.5
• CVE-2022-23094Libreswan 4.2 through 4.5 allows remote attackers to cause a…7.5
• CVE-2022-23095Open Design Alliance Drawings SDK before 2022.12.1 mishandle…7.8