CVE-2021-3516

There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

2.0% chance of exploitation in the next 30 days; higher than 81% of CVEs (scores of 2026-10-25)

CWE

CWE-416

Published

2021-06-01

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• debian:debian_linux
• fedoraproject:fedora
• netapp:clustered_data_ontap
• netapp:clustered_data_ontap_antivirus_connector
• netapp:ontap_select_deploy_administration_utility
• oracle:zfs_storage_appliance_kit
• redhat:enterprise_linux
• redhat:jboss_core_services
• xmlsoft:xmllint

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1954225
• https://gitlab.gnome.org/GNOME/libxml2/-/commit/1358d157d0bd83be1dfe356a69213df9fac0b539
• https://gitlab.gnome.org/GNOME/libxml2/-/issues/230
• https://lists.debian.org/debian-lts-announce/2021/05/msg00008.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/

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