CVE-2022-23308

CVE-2022-23308 is a high-severity vulnerability in Xmlsoft Libxml2 with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

• Severity: High (CVSS 3.x base score 7.5)
• CVSS v2: 4.3
• EPSS exploit prediction: 6% (92nd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-416
• Affected product: Xmlsoft Libxml2
• Published: 2022-02-26
• Last modified: 2026-06-17

Description

valid.c in libxml2 before 2.9.13 has a use-after-free of ID and IDREF attributes.

Frequently asked questions

What is CVE-2022-23308?

valid.c in libxml2 before 2.9.13 has a use-after-free of ID and IDREF attributes.

How severe is CVE-2022-23308?

CVE-2022-23308 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2022-23308 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-23308?

CVE-2022-23308 primarily affects Xmlsoft Libxml2. In total, 48 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-23308?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2022-23308 published?

CVE-2022-23308 was published on 2022-02-26 and last updated on 2026-06-17.

References

• http://seclists.org/fulldisclosure/2022/May/33
• http://seclists.org/fulldisclosure/2022/May/34
• http://seclists.org/fulldisclosure/2022/May/35
• http://seclists.org/fulldisclosure/2022/May/36
• http://seclists.org/fulldisclosure/2022/May/37
• http://seclists.org/fulldisclosure/2022/May/38
• https://github.com/GNOME/libxml2/commit/652dd12a858989b14eed4e84e453059cd3ba340e
• https://gitlab.gnome.org/GNOME/libxml2/-/blob/v2.9.13/NEWS
• https://lists.debian.org/debian-lts-announce/2022/04/msg00004.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LA3MWWAYZADWJ5F6JOUBX65UZAMQB7RF/
• https://security.gentoo.org/glsa/202210-03
• https://security.netapp.com/advisory/ntap-20220331-0008/
• https://support.apple.com/kb/HT213253
• https://support.apple.com/kb/HT213254
• https://support.apple.com/kb/HT213255
• https://support.apple.com/kb/HT213256
• https://support.apple.com/kb/HT213257
• https://support.apple.com/kb/HT213258
• https://www.oracle.com/security-alerts/cpujul2022.html

Affected products (48)

• cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
• cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
• cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:10.15.7:*:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-005:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-006:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-007:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-008:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-001:*:*:*:*:*:*
• cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-003:*:*:*:*:*:*
• cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
• cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
• cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
• cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:clustered_data_ontap_antivirus_connector:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:manageability_software_development_kit:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:smi-s_provider:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:snapdrive:-:*:*:*:*:unix:*:*
• cpe:2.3:a:netapp:snapmanager:-:*:*:*:*:oracle:*:*
• cpe:2.3:a:netapp:solidfire\,_enterprise_sds_\&_hci_storage_node:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:bootstrap_os:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Xmlsoft Libxml2

• CVE-2008-3529 — Critical (CVSS 10.0): Heap-based buffer overflow in the xmlParseAttValueComplex function in parser.c in libxml2 before 2.7.0 allows…
• CVE-2004-0989 — Critical (CVSS 10.0): Multiple buffer overflows in libXML 2.6.12 and 2.6.13 (libxml2), and possibly other versions, may allow remote…
• CVE-2017-7376 — Critical (CVSS 9.8): Buffer overflow in libxml2 allows remote attackers to execute arbitrary code by leveraging an incorrect limit for port…
• CVE-2017-7375 — Critical (CVSS 9.8): A flaw in libxml2 allows remote XML entity inclusion with default parser flags (i.e., when the caller did not request…
• CVE-2017-16931 — Critical (CVSS 9.8): parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the…
• CVE-2016-4658 — Critical (CVSS 9.8): xpointer.c in libxml2 before 2.9.5 (as used in Apple iOS before 10, OS X before 10.12, tvOS before 10, and watchOS…

All CVEs affecting Xmlsoft Libxml2 →

Other CWE-416 (Use After Free) vulnerabilities

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• CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
• CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
• CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
• CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…

Browse all CWE-416 (Use After Free) vulnerabilities →