CVE-2026-4426
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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2Tags
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.
Analysis
Libarchive fails to properly validate the pz_log2_bs field in ISO9660 Rock Ridge extensions during zisofs decompression, allowing remote attackers to supply a crafted ISO file that triggers undefined behavior and causes denial-of-service through incorrect memory allocation and application crashes. The vulnerability requires user interaction (ISO file opening) but no authentication, affects libarchive across multiple distributions, and carries a moderate EPSS score (0.11%, 30th percentile) suggesting low current exploitation probability despite the moderate CVSS severity.
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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