CVE-2026-4426

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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."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Hardened Images", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "libarchive-main", "defaultStatus": "affected", "versions": [{"version": "3.8.7-1.hum1", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:hummingbird:1"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "libarchive", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:enterprise_linux:10"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "libarchive", "defaultStatus": "unknown", "cpes": ["cpe:/o:redhat:rhel_els:6"]}, {"vendor": "Red Hat", 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["cpe:/a:redhat:openshift:4"]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:8944", "name": "RHSA-2026:8944", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/security/cve/CVE-2026-4426", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2449010", "name": "RHBZ#2449010", "tags": ["issue-tracking", "x_refsource_REDHAT"]}, {"url": "https://github.com/libarchive/libarchive/pull/2897"}], "datePublic": "2026-03-19T00:00:00.000Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-1335", "description": "Incorrect Bitwise Shift of Integer", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-1335: Incorrect Bitwise Shift of Integer", "workarounds": [{"lang": "en", "value": "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."}], "timeline": [{"lang": "en", "time": "2026-03-19T12:39:13.967Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-03-19T00:00:00.000Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank Elhanan Haenel for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-11-06T07:52:00.904Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-20T15:19:10.267574Z", "id": "CVE-2026-4426", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-20T15:19:18.305Z"}}]}}

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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."}, {"lang": "es", "value": "Se encontr\u00f3 un defecto en libarchive. Existe una vulnerabilidad de comportamiento indefinido en la l\u00f3gica de descompresi\u00f3n de zisofs, causada por una validaci\u00f3n incorrecta de un campo ('pz_log2_bs') le\u00eddo de las extensiones Rock Ridge de ISO9660. Un atacante remoto puede explotar esto al proporcionar un archivo ISO especialmente dise\u00f1ado. Esto puede llevar a una asignaci\u00f3n de memoria incorrecta y posibles ca\u00eddas de la aplicaci\u00f3n, lo que resulta en una condici\u00f3n de denegaci\u00f3n de servicio (DoS)."}], "id": "CVE-2026-4426", "lastModified": "2026-11-06T08:17:26.870", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4426", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-20T15:19:10.267574Z", "version": "2.0.3"}}]}, "published": "2026-03-19T15:16:28.510", "references": [{"source": "secalert@redhat.com", "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"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1335"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Elhanan Haenel for reporting this issue.", "bugzilla": {"description": "libarchive: libarchive: Denial of Service via malformed ISO file processing", "id": "2449010", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2449010"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1335", "details": ["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."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-4426", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "libarchive", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "libarchive", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "libarchive", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-03-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4426\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4426\nhttps://github.com/libarchive/libarchive/pull/2897"], "statement": "This MODERATE impact vulnerability in `libarchive`'s zisofs decompression logic can lead to a denial of service. The flaw is triggered when processing a specially crafted ISO9660 image containing an invalid shift exponent. Red Hat products that process untrusted ISO files using `libarchive` are susceptible to crashes.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 90.0, "confidence_source": "inferred", "scores": [{"score": 90.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "libarchive", "vendor": "libarchive"}, {"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": "2026-04-09T19:36:27.172025+00:00", "value": {"mitigation_remediation": ["Avoid processing untrusted ISO9660 images with libarchive", "Restrict ISO file sources to trusted originators", "Update libarchive to the latest version provided by Red\u00a0Hat when available", "Audit and monitor processes that use libarchive for unexpected crashes", "If possible, disable ISO9660 support in libarchive or use an alternative library"], "summary": {"action": "Apply Workaround", "impact": "Denial of Service via malformed ISO processing"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Red\u00a0Hat Enterprise Linux\u00a010, 6, 7, 8, and 9, as well as Red\u00a0Hat Hardened Images and Red\u00a0Hat OpenShift Container Platform\u00a04. The affected component is the libarchive library bundled with these distributions. No specific version ranges are listed, so any deployment of libarchive on these systems remains potentially vulnerable until an official fix is released.", "description_and_impact": "A flaw in libarchive\u2019s zisofs decompression logic allows a specially crafted ISO9660 file to trigger undefined behavior. When the bad \u2018pz_log2_bs\u2019 field is read, libarchive can allocate an incorrect amount of memory, causing the application that uses libarchive to crash. The crash results in a denial\u2011of\u2011service condition for any process that attempts to read the file. This weakness is classified as CWE\u20111335.", "risk_and_exploitability": "With a CVSS score of 6.5, the severity is moderate, and an EPSS score of less than 1\u202f% indicates that active exploitation is currently unlikely. The vulnerability is not listed in the CISA KEV catalog. Exploitation requires an attacker to supply a malicious ISO file that a user or service processes through libarchive. Because the attack vector is through local or potentially remote file handling, administrators should restrict exposure by controlling which ISO images are processed and by keeping the library up to date once a patch is available."}}}}, "created": "2026-03-20T08:56:48.889143+00:00", "updated": "2026-04-10T09:46:26.303569+00:00", "vendors": ["libarchive", "libarchive$PRODUCT$libarchive", "redhat", "redhat$PRODUCT$enterprise_linux", "redhat$PRODUCT$openshift_container_platform"]}