CVE-2026-5745

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A NULL pointer dereference vulnerability exists in the ACL parsing logic, specifically within the archive_acl_from_text_nl() function. When processing a malformed ACL string (such as a bare \"d\" or \"default\" tag without subsequent fields), the function fails to perform adequate validation before advancing the pointer. An attacker can exploit this by providing a maliciously crafted archive, causing an application utilizing the libarchive API (such as bsdtar) to crash, resulting in a Denial of Service (DoS)."}], "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": "affected", 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A NULL pointer dereference vulnerability exists in the ACL parsing logic, specifically within the archive_acl_from_text_nl() function. When processing a malformed ACL string (such as a bare \"d\" or \"default\" tag without subsequent fields), the function fails to perform adequate validation before advancing the pointer. An attacker can exploit this by providing a maliciously crafted archive, causing an application utilizing the libarchive API (such as bsdtar) to crash, resulting in a Denial of Service (DoS)."}, {"lang": "es", "value": "Se encontr\u00f3 una falla en libarchive. Existe una vulnerabilidad de desreferencia de puntero NULL en la l\u00f3gica de an\u00e1lisis de ACL, espec\u00edficamente dentro de la funci\u00f3n archive_acl_from_text_nl(). Al procesar una cadena ACL malformada (como una etiqueta \u2019d\u2019 o \u2019default\u2019 sin campos subsiguientes), la funci\u00f3n no realiza una validaci\u00f3n adecuada antes de avanzar el puntero. Un atacante puede explotar esto al proporcionar un archivo creado maliciosamente, causando que una aplicaci\u00f3n que utiliza la API de libarchive (como bsdtar) se bloquee, lo que resulta en una denegaci\u00f3n de servicio (DoS)."}], "id": "CVE-2026-5745", "lastModified": "2026-11-06T08:17:35.797", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-5745", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-07T16:31:17.821463Z", "version": "2.0.3"}}]}, "published": "2026-04-07T16:16:32.307", "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-2026-5745"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455921"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"bugzilla": {"description": "libarchive: A NULL pointer dereference vulnerability exists in the ACL parser of libarchive", "id": "2455921", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455921"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in libarchive. A NULL pointer dereference vulnerability exists in the ACL parsing logic, specifically within the archive_acl_from_text_nl() function. When processing a malformed ACL string (such as a bare \"d\" or \"default\" tag without subsequent fields), the function fails to perform adequate validation before advancing the pointer. An attacker can exploit this by providing a maliciously crafted archive, causing an application utilizing the libarchive API (such as bsdtar) to crash, resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-5745", "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": "Fix deferred", "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": "2026-04-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-5745\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-5745"], "statement": "This Moderate impact vulnerability in libarchive's ACL parsing logic can lead to a Denial of Service. An attacker could provide a specially crafted archive, causing applications that utilize the libarchive API, such as bsdtar, to crash when processing the malformed ACL string. This issue affects systems where applications process untrusted archives.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "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": "2026-04-09T17:31:39.341752+00:00", "value": {"mitigation_remediation": ["Check for and install the latest Red\u00a0Hat security update that addresses CVE\u20112026\u20115745.", "Verify the libarchive version on all affected systems with tools such as rpm\u00a0-iq libarchive.", "Temporarily restrict untrusted archive extraction until a patch is applied.", "Maintain routine OS and application updates to keep all libraries current.", "If unable to update immediately, monitor Red\u00a0Hat advisories for a patch or update the affected software package to a version that includes the fix once available."], "summary": {"action": "Apply Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects libarchive installed on Red\u202fHat Enterprise Linux releases 6 through 10, as well as Red\u202fHat Hardened Images and Red\u202fHat OpenShift Container Platform\u00a04. Systems running these distributions or containers that incorporate the affected libarchive library are at risk.", "description_and_impact": "The flaw is a null pointer dereference in the ACL parsing function of libarchive. When a malformed ACL string such as a lone 'd' or 'default' tag is parsed, the code fails to validate the pointer before advancing, leading to a crash. An attacker can supply a specially crafted archive that triggers this behavior, causing any application that uses the libarchive API, for example bsdtar, to terminate. The result is a denial of service through application failure. This weakness is a classic null pointer dereference (CWE\u2011476).", "risk_and_exploitability": "The CVSS score of 5.5 indicates moderate severity, and the EPSS score of less than 1\u202f% suggests a low probability of exploitation at this time. The vulnerability is not listed in the CISA KEV catalog. Exploitation requires an attacker to cause a malicious archive to be parsed by a vulnerable application, which can be achieved locally by any user owning a process that invokes libarchive, or remotely if the target runs a service that accepts untrusted archives. The lack of an available workaround and limited exploit evidence mean that the primary mitigation is to update to a patched version once released."}}}}, "created": "2026-04-08T19:48:33.891119+00:00", "updated": "2026-04-10T09:41:30.230760+00:00", "vendors": ["libarchive", "libarchive$PRODUCT$libarchive", "redhat", "redhat$PRODUCT$enterprise_linux", "redhat$PRODUCT$openshift_container_platform"]}