CVE-2026-4426

EUVD-2026-13099
A flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field (`pz_log2_bs`) read from ISO9660 Rock Ridge extensions. A remote attacker can exploit this by supplying a specially crafted ISO file. This can lead to incorrect memory allocation and potential application crashes, resulting in a denial-of-service (DoS) condition.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 21%
Affected Products (NVD)
VendorProductVersion
libarchivelibarchive
-
redhathardened_images
-
redhatopenshift_container_platform
4.0
redhatenterprise_linux
6.0
redhatenterprise_linux
7.0
redhatenterprise_linux
8.0
redhatenterprise_linux
9.0
redhatenterprise_linux
10.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
libarchive
bookworm
3.6.2-1+deb12u4
fixed
bookworm (security)
vulnerable
bullseye
vulnerable
bullseye (security)
3.4.3-2+deb11u4
fixed
forky
3.8.7-1
fixed
sid
3.8.7-1
fixed
trixie
3.7.4-4+deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
libarchive
bionic
Fixed 3.2.2-3.1ubuntu0.7+esm3
released
focal
Fixed 3.4.0-2ubuntu1.5+esm2
released
jammy
Fixed 3.6.0-1ubuntu1.7
released
noble
Fixed 3.7.2-2ubuntu0.7
released
questing
Fixed 3.7.7-0ubuntu3.2
released
resolute
Fixed 3.8.5-1ubuntu2.1
released
trusty
Fixed 3.1.2-7ubuntu2.8+esm5
released
xenial
Fixed 3.1.2-11ubuntu0.16.04.8+esm3
released
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
bsdtar
suse enterprise server 15 SP6
3.7.2-150600.3.20.1
fixed
libarchive-devel
suse enterprise desktop 15 SP7
3.7.2-150600.3.20.1
fixed
suse enterprise sap 15 SP7
3.7.2-150600.3.20.1
fixed
suse enterprise server 15 SP6
3.7.2-150600.3.20.1
fixed
suse enterprise server 15 SP7
3.7.2-150600.3.20.1
fixed
libarchive13
suse enterprise desktop 15 SP7
3.7.2-150600.3.20.1
fixed
suse enterprise sap 15 SP7
3.7.2-150600.3.20.1
fixed
suse enterprise server 15 SP6
3.7.2-150600.3.20.1
fixed
suse enterprise server 15 SP7
3.7.2-150600.3.20.1
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
libarchive
Azure Linux 3.0
0:3.7.7-6.azl3
fixed
Common Weakness Enumeration
References
https://access.redhat.com/errata/RHSA-2026:8944
https://access.redhat.com/security/cve/CVE-2026-4426
https://bugzilla.redhat.com/show_bug.cgi?id=2449010
https://github.com/libarchive/libarchive/pull/2897