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    CVE-2026-4426

    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.

    Published:Mar 19, 2026
    Last Modified:May 3, 2026
    EPS:Mar 19, 2026
    EPSS Score:0.00124
    CVSS Score:6.5

    Affected Products

    Vendor
    Libarchive
    Product
    Libarchive
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Hardened Images
    Vendor
    Redhat
    Product
    Hummingbird
    Vendor
    Redhat
    Product
    Openshift
    Vendor
    Redhat
    Product
    Openshift Container Platform

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-5745 (CVSS 5.5) — A flaw was found in libarchive. A NULL pointer dereference vulnerability exists in the ACL parsing logic, spec…
    CVE-2026-5121 (CVSS 7.5) — A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs bloc…
    CVE-2026-4424 (CVSS 7.5) — A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processin…
    CVE-2025-60753 (CVSS 5.5) — An issue was discovered in libarchive bsdtar before version 3.8.1 in function apply_substitution in file tar/s…
    CVE-2025-5916 (CVSS 3.9) — A vulnerability has been identified in the libarchive library. This flaw involves an integer overflow that can…
    CVE-2025-5918 (CVSS 3.9) — A vulnerability has been identified in the libarchive library. This flaw can be triggered when file streams ar…
    CVE-2025-5917 (CVSS 2.8) — A vulnerability has been identified in the libarchive library. This flaw involves an 'off-by-one' miscalculati…
    CVE-2025-5915 (CVSS 6.6) — A vulnerability has been identified in the libarchive library. This flaw can lead to a heap buffer over-read d…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High