CVE-2026-25210

EUVD-2026-5042
In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.9 MEDIUM
LOCAL
HIGH
NONE
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 9%
Affected Products (NVD)
VendorProductVersion
libexpat_projectlibexpat
𝑥
< 2.7.4
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
SiemensRUGGEDCOM RST2428P
𝑥
< V4.0
ADP
Debian logo
Debian Releases
Debian Product
Codename
expat
bookworm
no-dsa
bookworm (security)
vulnerable
bullseye
postponed
bullseye (security)
vulnerable
forky
2.8.2-1
fixed
sid
2.8.2-1
fixed
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
apache2
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
questing
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
questing
not-affected
resolute
not-affected
trusty
not-affected
xenial
not-affected
ayttm
jammy
dne
noble
dne
questing
dne
resolute
dne
xenial
ignored
cableswig
jammy
dne
noble
dne
questing
dne
resolute
dne
xenial
ignored
cadaver
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
needs-triage
resolute
needs-triage
xenial
ignored
cmake
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
xenial
not-affected
coin3
bionic
needs-triage
focal
not-affected
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
trusty
needs-triage
xenial
ignored
expat
bionic
Fixed 2.2.5-3ubuntu0.9+esm3
released
focal
Fixed 2.2.9-1ubuntu0.8+esm1
released
jammy
Fixed 2.4.7-1ubuntu0.7
released
noble
Fixed 2.6.1-2ubuntu0.4
released
questing
Fixed 2.7.1-2ubuntu0.2
released
resolute
not-affected
trusty
Fixed 2.1.0-4ubuntu1.4+esm11
released
xenial
Fixed 2.1.0-7ubuntu0.16.04.5+esm11
released
firefox
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
gdcm
bionic
needs-triage
focal
not-affected
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
trusty
not-affected
xenial
ignored
ghostscript
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
xenial
not-affected
insighttoolkit4
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
dne
questing
dne
resolute
dne
xenial
ignored
libxmltok
bionic
Fixed 1.2-4ubuntu0.18.04.1~esm6
released
focal
Fixed 1.2-4ubuntu0.20.04.1~esm6
released
jammy
Fixed 1.2-4ubuntu0.22.04.1~esm6
released
noble
Fixed 1.2-4.1ubuntu2.24.0.4.1+esm4
released
questing
dne
resolute
dne
xenial
Fixed 1.2-3ubuntu0.16.04.1~esm5
released
matanza
bionic
needs-triage
focal
ignored
jammy
ignored
noble
ignored
questing
ignored
resolute
ignored
xenial
ignored
smart
bionic
needs-triage
jammy
dne
noble
dne
questing
dne
resolute
dne
xenial
ignored
swish-e
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
needs-triage
resolute
needs-triage
xenial
ignored
tdom
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
needs-triage
resolute
needs-triage
xenial
ignored
texlive-bin
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
xenial
not-affected
thunderbird
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
vnc4
bionic
needs-triage
jammy
dne
noble
dne
questing
dne
resolute
dne
trusty
needs-triage
xenial
ignored
vtk
jammy
dne
noble
dne
questing
dne
resolute
dne
trusty
needs-triage
xenial
ignored
wbxml2
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
needs-triage
resolute
needs-triage
xenial
ignored
xmlrpc-c
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
needs-triage
resolute
needs-triage
trusty
needs-triage
xenial
ignored
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
expat
suse enterprise desktop 15 SP7
2.7.1-150700.3.9.2
fixed
suse enterprise sap 15 SP7
2.7.1-150700.3.9.2
fixed
suse enterprise server 12 SP3
2.7.1-21.49.1
fixed
suse enterprise server 15 SP4
2.7.1-150400.3.34.1
fixed
suse enterprise server 15 SP7
2.7.1-150700.3.9.2
fixed
libexpat-devel
suse enterprise desktop 15 SP7
2.7.1-150700.3.9.2
fixed
suse enterprise sap 15 SP7
2.7.1-150700.3.9.2
fixed
suse enterprise server 15 SP4
2.7.1-150400.3.34.1
fixed
suse enterprise server 15 SP7
2.7.1-150700.3.9.2
fixed
libexpat1
suse enterprise desktop 15 SP7
2.7.1-150700.3.9.2
fixed
suse enterprise sap 15 SP7
2.7.1-150700.3.9.2
fixed
suse enterprise server 12 SP3
2.7.1-21.49.1
fixed
suse enterprise server 15 SP4
2.7.1-150400.3.34.1
fixed
suse enterprise server 15 SP7
2.7.1-150700.3.9.2
fixed
libexpat1-32bit
suse enterprise desktop 15 SP7
2.7.1-150700.3.9.2
fixed
suse enterprise sap 15 SP7
2.7.1-150700.3.9.2
fixed
suse enterprise server 12 SP3
2.7.1-21.49.1
fixed
suse enterprise server 15 SP4
2.7.1-150400.3.34.1
fixed
suse enterprise server 15 SP7
2.7.1-150700.3.9.2
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
expat
Amazon Linux 2
0:2.1.0-15.amzn2.0.6
fixed
Amazon Linux 2023
0:2.6.3-1.amzn2023.0.4
fixed
expat-debuginfo
Amazon Linux 2
0:2.1.0-15.amzn2.0.6
fixed
Amazon Linux 2023
0:2.6.3-1.amzn2023.0.4
fixed
expat-debugsource
Amazon Linux 2023
0:2.6.3-1.amzn2023.0.4
fixed
expat-devel
Amazon Linux 2
0:2.1.0-15.amzn2.0.6
fixed
Amazon Linux 2023
0:2.6.3-1.amzn2023.0.4
fixed
expat-static
Amazon Linux 2
0:2.1.0-15.amzn2.0.6
fixed
Amazon Linux 2023
0:2.6.3-1.amzn2023.0.4
fixed
firefox
Amazon Linux 2023
0:140.7.0-1.amzn2023.0.2
fixed
firefox-debuginfo
Amazon Linux 2023
0:140.7.0-1.amzn2023.0.2
fixed
firefox-debugsource
Amazon Linux 2023
0:140.7.0-1.amzn2023.0.2
fixed
thunderbird
Amazon Linux 2
0:140.7.1-1.amzn2.0.2
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
expat
Azure Linux 3.0
0:2.6.4-4.azl3
fixed
CBL-Mariner 2.0
0:2.6.4-4.cm2
fixed
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://github.com/libexpat/libexpat/pull/1075
https://github.com/libexpat/libexpat/pull/1075/commits/9c2d990389e6abe2e44527eeaa8b39f16fe859c7
https://cert-portal.siemens.com/productcert/html/ssa-253495.html