{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-5121", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-03-30T07:39:27.352Z", "datePublished": "2026-03-30T07:47:28.562Z", "dateUpdated": "2026-05-14T22:36:41.927Z"}, "containers": {"cna": {"title": "Libarchive: libarchive: arbitrary code execution via integer overflow in iso9660 image processing", "metrics": [{"other": {"content": {"value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "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. 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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."}, {"lang": "es", "value": "Se encontr\u00f3 un fallo en libarchive. En sistemas de 32 bits, existe una vulnerabilidad de desbordamiento de entero en la l\u00f3gica de asignaci\u00f3n de punteros de bloque zisofs. Un atacante remoto puede explotar esto al proporcionar una imagen ISO9660 especialmente dise\u00f1ada, lo que puede llevar a un desbordamiento de b\u00fafer de pila. Esto podr\u00eda permitir potencialmente la ejecuci\u00f3n de c\u00f3digo arbitrario en el sistema afectado."}], "id": "CVE-2026-5121", "lastModified": "2026-05-14T23:16:37.413", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-03-30T08:16:18.780", "references": [{"source": "secalert@redhat.com", "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-2026:8510"}, {"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", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-5121"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452945"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://github.com/advisories/GHSA-2vwv-vqpv-v8vc"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/libarchive/libarchive/pull/2934"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-190"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Elhanan Haenel for reporting this issue.", "csaw": false, "details": ["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."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-5121", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "libarchive", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "libarchive", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "libarchive", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "libarchive", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "libarchive", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-03-30T07:44:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-5121\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-5121\nhttps://github.com/libarchive/libarchive/pull/2934"], "statement": "Important: 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.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Red Hat Enterprise Linux 10", "source": "cna", "vendor": "Red Hat"}, "product": "enterprise_linux", "vendor": "redhat"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 86.0, "confidence_source": "matching", "scores": [{"score": 86.0, "source": "matching"}]}, "original": {"product": "Red Hat OpenShift Container Platform 4", "source": "cna", "vendor": "Red Hat"}, "product": "openshift_container_platform", "vendor": "redhat"}], "analysis": {"en": {"generated_at": "2026-04-14T17:28:19.004352+00:00", "value": {"mitigation_remediation": ["Apply the latest Red\u202fHat security updates that replace the vulnerable libarchive library for all affected RHEL releases", "Ensure that the system remains fully patched by running the standard package manager update commands (yum/dnf update) and verifying that the libarchive package is at or above the patched version", "If the system must handle ISO images, restrict processing to ISO files obtained from trusted sources and avoid performing extraction on untrusted input", "Consider using alternative libraries or tools that do not contain the vulnerable code if remediation is not immediately possible", "Implement network controls to block exposure of applications that automatically extract ISO images from external sources"], "summary": {"action": "Immediate patch", "impact": "Remote code execution via heap overflow"}, "threat_synthesis": {"affected_systems": "Affected systems include Red\u202fHat Enterprise\u202fLinux distributions 6 through 10, Red\u202fHat Hardened Images, and Red\u202fHat OpenShift Container Platform\u202f4\u2014all of which ship libarchive. The flaw is limited to 32\u2011bit builds and impacts any component that extracts ISO9660 images, such as the default container runtime and related tooling.", "description_and_impact": "The vulnerability is an integer overflow in libarchive\u2019s ISO9660 zisofs block pointer allocation logic. Processing a specially crafted ISO image can trigger a heap buffer overflow, allowing an attacker to execute arbitrary code with the privileges of the process that uses libarchive. This weakness is classified as CWE\u2011190 and can lead to complete compromise of the affected system.", "risk_and_exploitability": "The CVSS score of 7.5 indicates high severity, yet the EPSS score is below 1\u202f%, showing rare exploitation evidence. The vulnerability is not listed in CISA\u2019s KEV catalog. Exploitation requires an application to process a malicious ISO image; thus, the attack vector is primarily through supply of untrusted ISO files, either locally or over a network service that extracts them. No additional conditions are noted beyond the use of libarchive on a 32\u2011bit system."}}}}, "created": "2026-03-30T20:56:01.781505+00:00", "updated": "2026-04-15T16:45:09.792727+00:00", "vendors": ["redhat", "redhat$PRODUCT$enterprise_linux", "redhat$PRODUCT$openshift_container_platform"]}