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CVE-2026-4426— Libarchive: libarchive: denial of service via malformed iso file processing

Quick assessment

Affected
Red Hat Red Hat Hardened Images
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libarchive是libarchive开源的一款多格式存档和压缩库。 libarchive存在安全漏洞，该漏洞源于zisofs解压缩逻辑中存在未定义行为，从ISO9660 Rock Ridge扩展中读取的pz_log2_bs字段验证不当，可能导致远程攻击者通过特制ISO文件造成内存分配错误和应用程序崩溃，引发拒绝服务。

CVSS 6.5 · Medium EPSS 0.56% · P45

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
Red Hat Red Hat Hardened Images 3.8.7-1.hum1< * unaffected
Red Hat Red Hat OpenShift Container Platform 4 any affected
any affected
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I. Basic Information for CVE-2026-4426

Vulnerability Information
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Vulnerability Title
Libarchive: libarchive: denial of service via malformed iso file processing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1335
Source: CVE Program / CVE List V5
Vulnerability Title
libarchive 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libarchive是libarchive开源的一款多格式存档和压缩库。 libarchive存在安全漏洞，该漏洞源于zisofs解压缩逻辑中存在未定义行为，从ISO9660 Rock Ridge扩展中读取的pz_log2_bs字段验证不当，可能导致远程攻击者通过特制ISO文件造成内存分配错误和应用程序崩溃，引发拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Hardened Images 3.8.7-1.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-4426

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III. Intelligence Information for CVE-2026-4426

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Patches & Fixes for CVE-2026-4426 (1)

Vendor Advisories for CVE-2026-4426 (2)

Same Patch Batch · Red Hat · 2026-03-19 · 3 CVEs total

CVE-2026-4424 7.5 HIGH Libarchive: libarchive: information disclosure via heap out-of-bounds read in rar archive
CVE-2026-2369 6.5 MEDIUM Libsoup: libsoup: buffer overread due to integer underflow when handling zero-length resou

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images
Same vendor: Red Hat
Same weakness: CWE-1335

V. Comments for CVE-2026-4426

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