A NULL pointer dereference vulnerability exists in the xpath.c:xmlXPathCompOpEval() function of libxml2 through 2.9.8 when parsing an invalid XPath expression in the XPATH_OP_AND or XPATH_OP_OR case. Applications processing untrusted XSL format inputs with the use of the libxml2 library may be vulnerable to a denial of service attack due to a crash of the application.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://gitlab.gnome.org/GNOME/libxml2/issues/10 Vendor Advisory
- https://gitlab.gnome.org/GNOME/libxml2/issues/10 Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.5 · canonical, debian, xmlsoftNVD modified 2026-10-14 07:16
Affected (CPE criteria) 6
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*cpe:2.3:o:debian:debian_linux:-:*:*:*:*:*:*:*cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*
References 19
- https://access.redhat.com/errata/RHSA-2019:1543
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901817 Mailing List, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1595985 Issue Tracking, Third Party Advisory
- https://gitlab.gnome.org/GNOME/libxml2/issues/10 Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2018/09/msg00035.html
- https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html
- https://security.netapp.com/advisory/ntap-20190719-0002/
- https://usn.ubuntu.com/3739-1/ Third Party Advisory
- https://usn.ubuntu.com/3739-2/ Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1543
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901817 Mailing List, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1595985 Issue Tracking, Third Party Advisory
- https://gitlab.gnome.org/GNOME/libxml2/issues/10 Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2018/09/msg00035.html
- https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html
- https://security.netapp.com/advisory/ntap-20190719-0002/
- https://usn.ubuntu.com/3739-1/ Third Party Advisory
- https://usn.ubuntu.com/3739-2/ Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html