CVE-2018-14404A 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.
Updated under an hour ago ()
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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-476
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
canonical ubuntu_linux canonical:ubuntu_linux | 12.04; 14.04; 16.04; 18.04 | NVD |
debian debian_linux debian:debian_linux | all versions | NVD |
xmlsoft libxml2 xmlsoft:libxml2 | through 2.9.8 | NVD |
References
- https://lists.debian.org/debian-lts-announce/2018/09/msg00035.htmlmailing-list, x-refsource-mlist
- https://gitlab.gnome.org/GNOME/libxml2/issues/10x-refsource-misc, vendor-advisory
- https://usn.ubuntu.com/3739-1/vendor-advisory, x-refsource-ubuntu, third-party-advisory
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901817x-refsource-misc, mailing-list, third-party-advisory
- https://usn.ubuntu.com/3739-2/vendor-advisory, x-refsource-ubuntu, third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1595985x-refsource-misc, issue-tracking, third-party-advisory
- https://access.redhat.com/errata/RHSA-2019:1543vendor-advisory, x-refsource-redhat
- https://security.netapp.com/advisory/ntap-20190719-0002/x-refsource-confirm
- https://lists.debian.org/debian-lts-announce/2020/09/msg00009.htmlmailing-list, x-refsource-mlist
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.