{"id":"CVE-2026-5121","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-5121","generatedAt":"2026-10-28T01:47:34.076Z","title":"On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic.","description":"A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.","published":"2026-03-30T08:16:19.000Z","lastModified":"2026-10-14T20:17:56.000Z","status":"Modified","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"cwe":["CWE-190"],"affected":["libarchive/libarchive","redhat/hardened images","redhat/openshift container platform","redhat/enterprise linux"],"epss":{"score":0.01073,"percentile":0.64677,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.07%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:10065","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:10097","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:11768","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:12071","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:12274","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:13812","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:14773","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:14937","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:15087","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:16008","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:16009","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:16030","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:16174","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:17596","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:19724","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:19725","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20040","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:21690","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:25096","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:72502","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82304","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82322","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82347","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82354","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82372","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82857","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82888","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:8510","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:8517","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:8521","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:8534","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:8864","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:8866","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:8867","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:8873","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:8908","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:8944","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:9026","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:9592","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:9832","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-5121","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2452945","source":"secalert@redhat.com"},{"url":"https://github.com/advisories/GHSA-2vwv-vqpv-v8vc","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://github.com/libarchive/libarchive/pull/2934","tags":["Issue Tracking","Patch"],"source":"secalert@redhat.com"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-585531.html","source":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-5121","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}