CVE & CISA-KEV Catalog

CVE-2026-4426

MEDIUM
6.5
CVSS v3
NVD

Description

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.

CWE-1335

How to fix

Remediation Available
libarchiveDebian
Fixed in:3.4.3-2+deb11u4CVE-2026-4426
Fixed in:3.6.2-1+deb12u4CVE-2026-4426
Fixed in:3.7.4-4+deb13u1CVE-2026-4426
Fixed in:3.8.7-1CVE-2026-4426
bsdcpioUbuntu
Fixed in:3.1.2-7ubuntu2.8+esm5USN-8292-1
Fixed in:3.1.2-11ubuntu0.16.04.8+esm3USN-8292-1
Fixed in:3.2.2-3.1ubuntu0.7+esm3USN-8292-1
bsdtarUbuntu
Fixed in:3.1.2-7ubuntu2.8+esm5USN-8292-1
Fixed in:3.1.2-11ubuntu0.16.04.8+esm3USN-8292-1
Fixed in:3.2.2-3.1ubuntu0.7+esm3USN-8292-1
libarchiveUbuntu
Fixed in:3.1.2-7ubuntu2.8+esm5USN-8292-1
Fixed in:3.1.2-11ubuntu0.16.04.8+esm3USN-8292-1
Fixed in:3.2.2-3.1ubuntu0.7+esm3USN-8292-1
Fixed in:3.4.0-2ubuntu1.5+esm2USN-8292-1
Fixed in:3.6.0-1ubuntu1.7USN-8292-1
Fixed in:3.7.2-2ubuntu0.7USN-8292-1
Fixed in:3.7.7-0ubuntu3.2USN-8292-1
libarchive-devUbuntu
Fixed in:3.1.2-7ubuntu2.8+esm5USN-8292-1
Fixed in:3.1.2-11ubuntu0.16.04.8+esm3USN-8292-1
Fixed in:3.2.2-3.1ubuntu0.7+esm3USN-8292-1
Fixed in:3.4.0-2ubuntu1.5+esm2USN-8292-1
Fixed in:3.6.0-1ubuntu1.7USN-8292-1
Fixed in:3.7.2-2ubuntu0.7USN-8292-1
Fixed in:3.7.7-0ubuntu3.2USN-8292-1
libarchive-toolsUbuntu
Fixed in:3.2.2-3.1ubuntu0.7+esm3USN-8292-1
Fixed in:3.4.0-2ubuntu1.5+esm2USN-8292-1
Fixed in:3.6.0-1ubuntu1.7USN-8292-1
Fixed in:3.7.2-2ubuntu0.7USN-8292-1
Fixed in:3.7.7-0ubuntu3.2USN-8292-1
libarchive13Ubuntu
Fixed in:3.1.2-7ubuntu2.8+esm5USN-8292-1
Fixed in:3.1.2-11ubuntu0.16.04.8+esm3USN-8292-1
Fixed in:3.2.2-3.1ubuntu0.7+esm3USN-8292-1
Fixed in:3.4.0-2ubuntu1.5+esm2USN-8292-1
Fixed in:3.6.0-1ubuntu1.7USN-8292-1
libarchive13t64Ubuntu
Fixed in:3.7.2-2ubuntu0.7USN-8292-1
Fixed in:3.7.7-0ubuntu3.2USN-8292-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

0.30%probability of exploitation in 30 days
22ndpercentile

Low risk: more likely to be exploited than 22% of all known CVEs.

References

Other references1
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-03.