CVE-2026-74860

EUVD-2026-72691
A flaw was found in libxml2 with Python bindings enabled. A remote attacker could exploit this vulnerability by providing a specially crafted XML document containing a Document Type Definition (DTD) with enumerated attribute values. This triggers a double-free error in the SAX attributeDecl callback handler, where a string is freed twice. This flaw can lead to a denial of service (DoS) due to a reproducible crash in Python applications using the libxml2 SAX bindings.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.5 HIGH
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 37.84%
Debian logo
Debian Releases
Debian Product
Codename
libxml2
bookworm
postponed
bookworm (security)
vulnerable
forky
2.15.4+dfsg-1
fixed
sid
2.15.4+dfsg-1
fixed
trixie
vulnerable
trixie (security)
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
libxml2
bionic
Fixed 2.9.4+dfsg1-6.1ubuntu1.9+esm8
released
focal
Fixed 2.9.10+dfsg-5ubuntu0.20.04.10+esm5
released
jammy
Fixed 2.9.13+dfsg-1ubuntu0.13
released
noble
Fixed 2.9.14+dfsg-1.3ubuntu3.9
released
resolute
Fixed 2.15.2+dfsg-0.1ubuntu0.2
released
trusty
Fixed 2.9.1+dfsg1-3ubuntu4.13+esm12
released
xenial
Fixed 2.9.3+dfsg1-1ubuntu0.7+esm13
released
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
libxml2
RHEL 8
0:2.9.7-21.el8_10.9
fixed
RHEL 9
0:2.9.13-14.el9_8.5
fixed
libxml2-devel
RHEL 8
0:2.9.7-21.el8_10.9
fixed
RHEL 9
0:2.9.13-14.el9_8.5
fixed
python3-libxml2
RHEL 8
0:2.9.7-21.el8_10.9
fixed
RHEL 9
0:2.9.13-14.el9_8.5
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
libxml2
Amazon Linux 2
0:2.9.1-6.amzn2.5.27
fixed
Amazon Linux 2023
0:2.10.4-1.amzn2023.0.21
fixed
libxml2-debuginfo
Amazon Linux 2
0:2.9.1-6.amzn2.5.27
fixed
Amazon Linux 2023
0:2.10.4-1.amzn2023.0.21
fixed
libxml2-debugsource
Amazon Linux 2023
0:2.10.4-1.amzn2023.0.21
fixed
libxml2-devel
Amazon Linux 2
0:2.9.1-6.amzn2.5.27
fixed
Amazon Linux 2023
0:2.10.4-1.amzn2023.0.21
fixed
libxml2-python
Amazon Linux 2
0:2.9.1-6.amzn2.5.27
fixed
libxml2-static
Amazon Linux 2
0:2.9.1-6.amzn2.5.27
fixed
Amazon Linux 2023
0:2.10.4-1.amzn2023.0.21
fixed
python3-libxml2
Amazon Linux 2023
0:2.10.4-1.amzn2023.0.21
fixed
python3-libxml2-debuginfo
Amazon Linux 2023
0:2.10.4-1.amzn2023.0.21
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
libxml2
Azure Linux 3.0
0:2.11.5-11.azl3
fixed
Common Weakness Enumeration
References
https://access.redhat.com/errata/RHSA-2026:64463
https://access.redhat.com/errata/RHSA-2026:71585
https://access.redhat.com/errata/RHSA-2026:71586
https://access.redhat.com/errata/RHSA-2026:71641
https://access.redhat.com/errata/RHSA-2026:72470
https://access.redhat.com/errata/RHSA-2026:72475
https://access.redhat.com/errata/RHSA-2026:72476
https://access.redhat.com/errata/RHSA-2026:79357
https://access.redhat.com/errata/RHSA-2026:82939
https://access.redhat.com/security/cve/CVE-2026-74860
https://bugzilla.redhat.com/show_bug.cgi?id=2529697