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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.","epss":{"date":"2026-11-05","percentile":0.24807,"score":0.00317},"exploits":[],"kev":null,"metrics":[{"score":6.5,"severity":"medium","source":"CNA: redhat","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"},{"score":6.5,"severity":"medium","source":"NVD: secalert@redhat.com","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1793951520904,"publishedAt":1773928419318,"references":[{"source":"CNA: redhat","tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:8944"},{"source":"CNA: redhat","tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-4426"},{"source":"CNA: redhat","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2449010"},{"source":"CNA: redhat","tags":[],"url":"https://github.com/libarchive/libarchive/pull/2897"},{"source":"secalert@redhat.com","tags":[],"url":"https://access.redhat.com/errata/RHSA-2026:8944"},{"source":"secalert@redhat.com","tags":["Third Party Advisory"],"url":"https://access.redhat.com/security/cve/CVE-2026-4426"},{"source":"secalert@redhat.com","tags":["Issue Tracking","Third Party Advisory"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2449010"},{"source":"secalert@redhat.com","tags":["Issue Tracking","Patch"],"url":"https://github.com/libarchive/libarchive/pull/2897"}],"remediation":[{"kind":"workaround","source":"CNA: redhat","text":"To mitigate this issue, avoid processing untrusted ISO9660 images with `libarchive`. Restricting the sources of ISO files and ensuring they originate from trusted entities can prevent exploitation."},{"kind":"fix","source":"secalert@redhat.com","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/libarchive/libarchive/pull/2897"}],"revision":"8772690d8102081d54bcecb803f228b36d866c1d1f529f958422dbf7e7aaa145","sources":[{"modifiedAt":1793951520904,"name":"CNA: redhat","retrievedAt":1793952575523,"url":"https://www.cve.org/CVERecord?id=CVE-2026-4426"},{"modifiedAt":1793913530970,"name":"NVD","retrievedAt":1793946124216,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4426"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793913859506,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-4426"}],"ssvc":{"assessedAt":1774019950267,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Libarchive: libarchive: denial of service via malformed iso file processing","updatedAt":1793952575523}