CVE-2026-95520

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Parsing a symlink entry in an untrusted RPM package whose declared RPMTAG_LONGFILESIZES value is 0xFFFFFFFFFFFFFFFF causes an integer overflow in iterReadArchiveNext() that shrinks a buffer allocation to one byte, after which the payload's independently-controlled cpio filesize field is used to write attacker-controlled data past the end of that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an untrusted package."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "rpm", "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": "rpm", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:rhel_els:6"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "rpm", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:rhel_els:7"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "rpm", "defaultStatus": 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(RHOAI)", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "rhoai/odh-ogx-k8s-operator-rhel9", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:openshift_ai"]}, {"vendor": "Red Hat", "product": "Red Hat OpenShift AI (RHOAI)", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "rhoai/odh-ogx-module-operator-rhel9", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:openshift_ai"]}, {"vendor": "Red Hat", "product": "Red Hat OpenShift AI (RHOAI)", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "rhoai/odh-training-operator-rhel9", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:openshift_ai"]}, {"vendor": "Red Hat", "product": "Red Hat OpenShift AI (RHOAI)", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "rhoai/odh-trustyai-service-operator-rhel9", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:openshift_ai"]}, {"vendor": "Red Hat", "product": "Red Hat OpenShift AI (RHOAI)", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "rhoai/odh-workbenches-operator-rhel9", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:openshift_ai"]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-95520", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2537809", "name": "RHBZ#2537809", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "datePublic": "2026-09-29T10:54:13.157Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-787", "description": "Out-of-bounds Write", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-787: Out-of-bounds Write", "workarounds": [{"lang": "en", "value": "To reduce exposure, avoid processing or extracting RPM packages from untrusted sources. Do not use `rpm2cpio`, `rpm2archive`, or `rpm -qlvp` on RPM files whose origin and integrity cannot be verified."}], "timeline": [{"lang": "en", "time": "2026-09-18T09:42:14.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-09-29T10:54:13.157Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank tao pan for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-11-06T07:38:05.396Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-29T13:17:45.627559Z", "id": "CVE-2026-95520", "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": "2026-09-29T13:19:42.202Z"}}]}}

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This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an untrusted package."}], "id": "CVE-2026-95520", "lastModified": "2026-11-06T08:17:39.483", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-95520", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-29T13:17:45.627559Z", "version": "2.0.3"}}]}, "published": "2026-09-29T12:17:12.650", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-95520"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2537809"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank tao pan for reporting this issue.", "bugzilla": {"description": "rpm: rpm: integer overflow in iterReadArchiveNext() leads to heap-based buffer overflow when parsing untrusted RPM packages", "id": "2537809", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2537809"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A heap-based buffer overflow flaw was found in rpm. Parsing a symlink entry in an untrusted RPM package whose declared RPMTAG_LONGFILESIZES value is 0xFFFFFFFFFFFFFFFF causes an integer overflow in iterReadArchiveNext() that shrinks a buffer allocation to one byte, after which the payload's independently-controlled cpio filesize field is used to write attacker-controlled data past the end of that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an untrusted package."], "mitigation": {"lang": "en:us", "value": "To reduce exposure, avoid processing or extracting RPM packages from untrusted sources. Do not use `rpm2cpio`, `rpm2archive`, or `rpm -qlvp` on RPM files whose origin and integrity cannot be verified."}, "name": "CVE-2026-95520", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "rpm", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "rpm", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "rpm", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "rpm", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "rpm", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "rpm", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-09-29T10:54:13Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-95520\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-95520"], "statement": "This issue is rated Moderate because, while parsing a crafted RPM triggers an attacker-controlled-length heap write, exploitation is local: a user or automated workflow must choose to run rpm2cpio, rpm2archive, rpm -qlvp, or an install/rebuild against the untrusted package. The flaw is not exposed as a network service, consistent with other Moderate-rated integer-overflow/heap-overflow flaws already tracked against the same iterReadArchiveNext() symlink-handling code path.", "threat_severity": "Moderate"}

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