CVE-2026-4426 — Incorrect Bitwise Shift of Integer in Libarchive

CWE-1335 — Incorrect Bitwise Shift of Integer7 documents7 sources
Severity
6.5MEDIUMNVD
EPSS
0.1%
top 67.09%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Debian LibarchiveMsrc Azl3 Libarchive 3.7.7-4 ON Azure Linux 3.0Msrc Cbl2 Libarchive 3.6.1-8 ON CBL Mariner 2.0
Timeline
PublishedMar 19

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages3 packages

🔴Vulnerability Details

2
GHSA
GHSA-r3fp-vrpw-pg77: A flaw was found in libarchive↗2026-03-19
▶
OSV
CVE-2026-4426: A flaw was found in libarchive↗2026-03-19
▶

📋Vendor Advisories

3
Red Hat
libarchive: libarchive: Denial of Service via malformed ISO file processing↗2026-03-19
▶
Microsoft
Libarchive: libarchive: denial of service via malformed iso file processing↗2026-03-10
▶
Debian
CVE-2026-4426: libarchive - A flaw was found in libarchive. An Undefined Behavior vulnerability exists in th...↗2026
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-4426 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶