{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-88265", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-09-10T01:57:19.212Z", "datePublished": "2026-09-10T08:57:03.229Z", "dateUpdated": "2026-09-10T08:57:03.229Z"}, "containers": {"cna": {"title": "Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown", "metrics": [{"other": {"content": {"value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can follow a symlink and attach a host file to container stdio, then change that file's ownership. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Hardened Images", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "crun", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:hummingbird:1"]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-88265", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531224", "name": "RHBZ#2531224", "tags": ["issue-tracking", "x_refsource_REDHAT"]}, {"url": "https://github.com/containers/crun/"}], "datePublic": "2026-09-09T00:00:00.000Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-59", "description": "Improper Link Resolution Before File Access ('Link Following')", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-59: Improper Link Resolution Before File Access ('Link Following')", "workarounds": [{"lang": "en", "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."}], "timeline": [{"lang": "en", "time": "2026-09-09T16:44:11.725Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-09-09T00:00:00.000Z", "value": "Made public."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-09-10T08:57:03.229Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

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{"affected": [{"affectedData": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:hummingbird:1"], "defaultStatus": "affected", "packageName": "crun", "product": "Red Hat Hardened Images", "vendor": "Red Hat"}], "source": "secalert@redhat.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can follow a symlink and attach a host file to container stdio, then change that file's ownership. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet."}], "id": "CVE-2026-88265", "lastModified": "2026-09-10T09:17:03.523", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.1, "impactScore": 4.0, "source": "secalert@redhat.com", "type": "Primary"}]}, "published": "2026-09-10T09:17:03.523", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-88265"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531224"}, {"source": "secalert@redhat.com", "url": "https://github.com/containers/crun/"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-59"}], "source": "secalert@redhat.com", "type": "Primary"}]}

{"bugzilla": {"description": "crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown", "id": "2531224", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531224"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-59", "details": ["A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can follow a symlink and attach a host file to container stdio, then change that file's ownership. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet."], "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-2026-88265", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "crun", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-09-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-88265\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-88265\nhttps://github.com/containers/crun/"], "statement": "This Moderate flaw in crun allows a non-root container process to write to and change ownership of a host bind-mounted file. Exploitation requires a malicious container image to replace /dev/null with a symlink while /dev is not mounted within the container, indicating specific preconditions for successful attack.", "threat_severity": "Moderate"}