CVE-2026-102633

EUVD-2026-89028
libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
5.9 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 34.2%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP \(6ES7518-4AX00-1AB0\)
V3.1.7 ≤
𝑥
< *
ADP
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP \(6ES7518-4AX00-1AC0\)
V3.1.7 ≤
𝑥
< *
ADP
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP \(6ES7518-4FX00-1AB0\)
V3.1.7 ≤
𝑥
< *
ADP
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP \(6ES7518-4FX00-1AC0\)
V3.1.7 ≤
𝑥
< *
ADP
SiemensSIPLUS S7-1500 CPU 1518-4 PN/DP MFP \(6AG1518-4AX00-4AC0\)
V3.1.7 ≤
𝑥
< *
ADP
libexpat_projectlibexpat
2.7.2 ≤
𝑥
≤ 2.8.5
CNA
Debian logo
Debian Releases
Debian Product
Codename
expat
bookworm
vulnerable
bookworm (security)
2.5.0-1+deb12u5
fixed
forky
2.10.0-1
fixed
sid
2.10.0-1
fixed
trixie
vulnerable
trixie (security)
2.9.0-1~deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
expat
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
trusty
needs-triage
xenial
needs-triage
apache2
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
resolute
not-affected
trusty
not-affected
xenial
not-affected
apr-util
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
resolute
not-affected
trusty
not-affected
xenial
not-affected
cmake
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
resolute
not-affected
xenial
not-affected
ghostscript
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
resolute
not-affected
xenial
not-affected
texlive-bin
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
resolute
not-affected
xenial
not-affected
xmlrpc-c
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
trusty
needs-triage
xenial
needs-triage
vnc4
bionic
needs-triage
jammy
dne
noble
dne
resolute
dne
trusty
needs-triage
xenial
needs-triage
wbxml2
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
xenial
needs-triage
swish-e
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
xenial
needs-triage
insighttoolkit4
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
dne
resolute
dne
xenial
needs-triage
cadaver
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
xenial
needs-triage
gdcm
bionic
needs-triage
focal
not-affected
jammy
not-affected
noble
not-affected
resolute
not-affected
trusty
not-affected
xenial
needs-triage
ayttm
jammy
dne
noble
dne
resolute
dne
xenial
needs-triage
cableswig
jammy
dne
noble
dne
resolute
dne
xenial
needs-triage
coin3
bionic
needs-triage
focal
not-affected
jammy
not-affected
noble
not-affected
resolute
not-affected
trusty
needs-triage
xenial
needs-triage
matanza
bionic
needs-triage
focal
ignored
jammy
ignored
noble
ignored
resolute
ignored
xenial
needs-triage
tdom
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
xenial
needs-triage
vtk
jammy
dne
noble
dne
resolute
dne
trusty
needs-triage
xenial
needs-triage
smart
bionic
needs-triage
jammy
dne
noble
dne
resolute
dne
xenial
needs-triage
firefox
jammy
not-affected
noble
not-affected
resolute
not-affected
thunderbird
jammy
not-affected
noble
not-affected
resolute
not-affected
libxmltok
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
dne
xenial
needs-triage
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
expat
suse enterprise desktop 15 SP7
2.8.5-150700.3.15.1
fixed
suse enterprise sap 12 SP5
2.8.5-21.55.1
fixed
suse enterprise sap 15 SP4
2.8.5-150400.3.40.1
fixed
suse enterprise sap 15 SP5
2.8.5-150400.3.40.1
fixed
suse enterprise sap 15 SP6
2.8.5-150400.3.40.1
fixed
suse enterprise sap 15 SP7
2.8.5-150700.3.15.1
fixed
suse enterprise server 12 SP3
2.8.5-21.55.1
fixed
suse enterprise server 12 SP5
2.8.5-21.55.1
fixed
suse enterprise server 15 SP4
2.8.5-150400.3.40.1
fixed
suse enterprise server 15 SP5
2.8.5-150400.3.40.1
fixed
suse enterprise server 15 SP6
2.8.5-150400.3.40.1
fixed
suse enterprise server 15 SP7
2.8.5-150700.3.15.1
fixed
libexpat-devel
suse enterprise desktop 15 SP7
2.8.5-150700.3.15.1
fixed
suse enterprise sap 12 SP5
2.8.5-21.55.1
fixed
suse enterprise sap 15 SP4
2.8.5-150400.3.40.1
fixed
suse enterprise sap 15 SP5
2.8.5-150400.3.40.1
fixed
suse enterprise sap 15 SP6
2.8.5-150400.3.40.1
fixed
suse enterprise sap 15 SP7
2.8.5-150700.3.15.1
fixed
suse enterprise server 12 SP5
2.8.5-21.55.1
fixed
suse enterprise server 15 SP4
2.8.5-150400.3.40.1
fixed
suse enterprise server 15 SP5
2.8.5-150400.3.40.1
fixed
suse enterprise server 15 SP6
2.8.5-150400.3.40.1
fixed
suse enterprise server 15 SP7
2.8.5-150700.3.15.1
fixed
libexpat1
suse enterprise desktop 15 SP7
2.8.5-150700.3.15.1
fixed
suse enterprise sap 12 SP5
2.8.5-21.55.1
fixed
suse enterprise sap 15 SP4
2.8.5-150400.3.40.1
fixed
suse enterprise sap 15 SP5
2.8.5-150400.3.40.1
fixed
suse enterprise sap 15 SP6
2.8.5-150400.3.40.1
fixed
suse enterprise sap 15 SP7
2.8.5-150700.3.15.1
fixed
suse enterprise server 12 SP3
2.8.5-21.55.1
fixed
suse enterprise server 12 SP5
2.8.5-21.55.1
fixed
suse enterprise server 15 SP4
2.8.5-150400.3.40.1
fixed
suse enterprise server 15 SP5
2.8.5-150400.3.40.1
fixed
suse enterprise server 15 SP6
2.8.5-150400.3.40.1
fixed
suse enterprise server 15 SP7
2.8.5-150700.3.15.1
fixed
libexpat1-32bit
suse enterprise desktop 15 SP7
2.8.5-150700.3.15.1
fixed
suse enterprise sap 12 SP5
2.8.5-21.55.1
fixed
suse enterprise sap 15 SP4
2.8.5-150400.3.40.1
fixed
suse enterprise sap 15 SP5
2.8.5-150400.3.40.1
fixed
suse enterprise sap 15 SP6
2.8.5-150400.3.40.1
fixed
suse enterprise sap 15 SP7
2.8.5-150700.3.15.1
fixed
suse enterprise server 12 SP3
2.8.5-21.55.1
fixed
suse enterprise server 12 SP5
2.8.5-21.55.1
fixed
suse enterprise server 15 SP4
2.8.5-150400.3.40.1
fixed
suse enterprise server 15 SP5
2.8.5-150400.3.40.1
fixed
suse enterprise server 15 SP6
2.8.5-150400.3.40.1
fixed
suse enterprise server 15 SP7
2.8.5-150700.3.15.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
expat
RHEL 8
0:2.5.0-6.el8_10
fixed
RHEL 9
0:2.5.0-9.el9_9.4
fixed
expat-devel
RHEL 8
0:2.5.0-6.el8_10
fixed
RHEL 9
0:2.5.0-9.el9_9.4
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
firefox
Amazon Linux 2023
0:140.17.0-1.amzn2023.0.1
fixed
firefox-debuginfo
Amazon Linux 2023
0:140.17.0-1.amzn2023.0.1
fixed
firefox-debugsource
Amazon Linux 2023
0:140.17.0-1.amzn2023.0.1
fixed
thunderbird
Amazon Linux 2
0:153.5.1-1.amzn2.0.1
fixed
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://github.com/libexpat/libexpat
https://github.com/libexpat/libexpat/blob/R_2_8_5/expat/lib/xmlparse.c#L1003
https://github.com/libexpat/libexpat/commit/209801d7fbaf07ab74bae8cb32dd2ab9e5846118
https://github.com/libexpat/libexpat/pull/1392
https://www.vulncheck.com/advisories/libexpat-2.7.2-through-2.8.5-integer-overflow-in-expat-realloc
https://cert-portal.siemens.com/productcert/html/ssa-457936.html