{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-5121", "tracking": { "current_release_date": "2026-04-02T13:11:42.325907Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-5121", "initial_release_date": "2026-01-13T00:58:53.406584Z", "revision_history": [ { "date": "2026-01-13T00:58:53.406584Z", "number": "1", "summary": "NCSC Score created." }, { "date": "2026-03-30T08:25:45.653061Z", "number": "2", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (2)." }, { "date": "2026-03-30T08:38:41.911269Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (2)." }, { "date": "2026-03-30T11:34:57.856576Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-30T12:32:57.241223Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (12).| Product Identifiers created (6).| Product Remediations created (12).| References created (3).| Vendor_assessment created." }, { "date": "2026-03-30T12:33:03.576997Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-30T14:11:46.872208Z", "number": "7", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-31T00:43:12.490763Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Products connected (2)." }, { "date": "2026-03-31T00:43:19.084503Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-31T04:38:46.054789Z", "number": "10", "summary": "Unknown change." }, { "date": "2026-03-31T06:43:46.264597Z", "number": "11", "summary": "Description created for source." }, { "date": "2026-03-31T10:09:55.253606Z", "number": "12", "summary": "Source created.| CVE status created. (valid)| Products connected (1).| Product Identifiers created (1).| References created (5)." }, { "date": "2026-03-31T10:09:58.708808Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-03-31T14:39:46.109622Z", "number": "14", "summary": "CVSS created.| CWES updated (1)." }, { "date": "2026-03-31T14:39:48.347125Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-03-31T15:25:15.794132Z", "number": "16", "summary": "CVSS created.| CWES updated (1)." }, { "date": "2026-03-31T15:25:17.832615Z", "number": "17", "summary": "NCSC Score updated." }, { "date": "2026-04-01T15:02:07.653974Z", "number": "18", "summary": "EPSS updated." }, { "date": "2026-04-01T15:02:13.825908Z", "number": "19", "summary": "NCSC Score updated." }, { "date": "2026-04-02T12:19:59.858150Z", "number": "20", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created." }, { "date": "2026-04-02T12:20:09.691868Z", "number": "21", "summary": "NCSC Score updated." } ], "status": "interim", "version": "21" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5875727", "product_identification_helper": { "cpe": "cpe:/a:libarchive:libarchive:-" } } } ], "category": "product_name", "name": "Open Source libarchive" } ], "category": "vendor", "name": "Open Source" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/10", "product": { "name": "vers:rpm/10", "product_id": "CSAFPID-2858634", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:10" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/6", "product": { "name": "vers:rpm/6", "product_id": "CSAFPID-1439321", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:6" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 6" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/7", "product": { "name": "vers:rpm/7", "product_id": "CSAFPID-1439315", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:7" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 7" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/8", "product": { "name": "vers:rpm/8", "product_id": "CSAFPID-1439317", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:8" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/9", "product": { "name": "vers:rpm/9", "product_id": "CSAFPID-1439319", "product_identification_helper": { "cpe": "cpe:/a:redhat:enterprise_linux:9" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/4", "product": { "name": "vers:rpm/4", "product_id": "CSAFPID-1439328", "product_identification_helper": { "cpe": "cpe:/a:redhat:openshift:4" } } } ], "category": "product_name", "name": "Red Hat OpenShift Container Platform 4" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5170309" } } ], "category": "product_name", "name": "libarchive" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2159482" } } ], "category": "product_name", "name": "libarchive" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 6" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2159483" } } ], "category": "product_name", "name": "libarchive" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 7" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2159484" } } ], "category": "product_name", "name": "libarchive" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2159485" } } ], "category": "product_name", "name": "libarchive" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 9" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1439329" } } ], "category": "product_name", "name": "rhcos" } ], "category": "product_family", "name": "Red Hat OpenShift Container Platform 4" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-2133934" } } ], "category": "product_name", "name": "libarchive" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-2133935" } } ], "category": "product_name", "name": "libarchive" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "Debian" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-5121", "cwe": { "id": "CWE-190", "name": "Integer Overflow or Wraparound" }, "notes": [ { "category": "description", "text": "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.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-5121" }, { "category": "description", "text": "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.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/5xxx/CVE-2026-5121.json" }, { "category": "description", "text": "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.\nImportant: An integer overflow flaw in `libarchive` on 32-bit systems can lead to a heap buffer overflow. This vulnerability occurs when processing a specially crafted ISO9660 image, allowing an attacker to potentially execute arbitrary code. Red Hat Enterprise Linux 64-bit systems are not affected by this flaw.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-5121.json" }, { "category": "description", "text": "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.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-5121" }, { "category": "description", "text": "Libarchive: libarchive: arbitrary code execution via integer overflow in iso9660 image processing", "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "other", "text": "0.00185", "title": "EPSS" }, { "category": "other", "text": "3.7", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to (a version of) an uncommon product, There is cwe data available from source Nvd, Is related to a product by vendor Open Source, The value of the most recent EPSS score, There is product data available from source Debian", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1439321", "CSAFPID-1439328", "CSAFPID-1439329", "CSAFPID-2159482", "CSAFPID-2159483", "CSAFPID-2159484", "CSAFPID-2159485", "CSAFPID-2858634", "CSAFPID-5170309", "CSAFPID-2133934", "CSAFPID-2133935", "CSAFPID-5875727" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-5121" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/5xxx/CVE-2026-5121.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-5121.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-5121" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0923.json" }, { "category": "external", "summary": "Source - microsoft", "url": "https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://access.redhat.com/security/cve/CVE-2026-5121" }, { "category": "external", "summary": "Reference - certbundde; cveprojectv5; nvd; redhat", "url": "https://github.com/libarchive/libarchive/pull/2934" }, { "category": "external", "summary": "Reference - certbundde; redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-5121" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5121" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0923.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0923" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://euvd.enisa.europa.eu/enisa/EUVD-2026-17073" } ], "remediations": [ { "category": "mitigation", "details": "To mitigate this issue, avoid processing untrusted ISO9660 images with applications that utilize `libarchive`. Users should only extract or read content from ISO images obtained from trusted sources.", "product_ids": [ "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1439321", "CSAFPID-1439328", "CSAFPID-1439329", "CSAFPID-2159482", "CSAFPID-2159483", "CSAFPID-2159484", "CSAFPID-2159485", "CSAFPID-2858634", "CSAFPID-5170309" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1439321", "CSAFPID-1439328", "CSAFPID-1439329", "CSAFPID-2133934", "CSAFPID-2133935", "CSAFPID-2159482", "CSAFPID-2159483", "CSAFPID-2159484", "CSAFPID-2159485", "CSAFPID-2858634", "CSAFPID-5170309", "CSAFPID-5875727" ] } ], "title": "CVE-2026-5121" } ] }