CVE-2026-56132

EUVD-2026-37977
In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.
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: 1%
Affected Products (NVD)
VendorProductVersion
libexpat_projectlibexpat
𝑥
< 2.8.2
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
expat
bookworm
vulnerable
bookworm (security)
vulnerable
bullseye
vulnerable
bullseye (security)
vulnerable
forky
2.8.2-1
fixed
sid
2.8.2-1
fixed
trixie
vulnerable
trixie (security)
2.8.2-1~deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
expat
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
trusty
needs-triage
xenial
needs-triage
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
cmake
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
xenial
not-affected
ghostscript
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
xenial
not-affected
texlive-bin
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
xenial
not-affected
xmlrpc-c
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
trusty
needs-triage
vnc4
bionic
needs-triage
jammy
dne
noble
dne
questing
dne
resolute
dne
trusty
needs-triage
wbxml2
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
swish-e
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
insighttoolkit4
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
dne
questing
dne
resolute
dne
cadaver
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
gdcm
bionic
needs-triage
focal
not-affected
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
trusty
not-affected
ayttm
jammy
dne
noble
dne
questing
dne
resolute
dne
cableswig
jammy
dne
noble
dne
questing
dne
resolute
dne
coin3
bionic
needs-triage
focal
not-affected
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
trusty
needs-triage
matanza
bionic
needs-triage
focal
ignored
jammy
ignored
noble
ignored
questing
ignored
resolute
ignored
tdom
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
vtk
jammy
dne
noble
dne
questing
dne
resolute
dne
trusty
needs-triage
smart
bionic
needs-triage
jammy
dne
noble
dne
questing
dne
resolute
dne
firefox
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
thunderbird
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
libxmltok
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
dne
resolute
dne
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
expat
Amazon Linux 2
0:2.1.0-15.amzn2.0.7
fixed
Amazon Linux 2023
0:2.6.3-1.amzn2023.0.5
fixed
expat-debuginfo
Amazon Linux 2
0:2.1.0-15.amzn2.0.7
fixed
Amazon Linux 2023
0:2.6.3-1.amzn2023.0.5
fixed
expat-debugsource
Amazon Linux 2023
0:2.6.3-1.amzn2023.0.5
fixed
expat-devel
Amazon Linux 2
0:2.1.0-15.amzn2.0.7
fixed
Amazon Linux 2023
0:2.6.3-1.amzn2023.0.5
fixed
expat-static
Amazon Linux 2
0:2.1.0-15.amzn2.0.7
fixed
Amazon Linux 2023
0:2.6.3-1.amzn2023.0.5
fixed
firefox
Amazon Linux 2023
0:140.12.0-1.amzn2023.0.1
fixed
firefox-debuginfo
Amazon Linux 2023
0:140.12.0-1.amzn2023.0.1
fixed
firefox-debugsource
Amazon Linux 2023
0:140.12.0-1.amzn2023.0.1
fixed
thunderbird
Amazon Linux 2
0:140.12.0-1.amzn2.0.1
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
expat
Azure Linux 3.0
0:2.8.2-1.azl3
fixed
Common Weakness Enumeration
References
https://github.com/libexpat/libexpat/pull/1272