CVE-2026-52791

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-52791", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-08T18:02:19.731Z", "datePublished": "2026-07-29T16:14:46.724Z", "dateUpdated": "2026-07-29T17:56:43.388Z"}, "containers": {"cna": {"title": "fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)", "problemTypes": [{"descriptions": [{"cweId": "CWE-266", "lang": "en", "description": "CWE-266: Incorrect Privilege Assignment", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 2, "baseSeverity": "LOW", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h"}, {"name": "https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f", "tags": ["x_refsource_MISC"], "url": "https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f"}, {"name": "https://github.com/containers/fuse-overlayfs/releases/tag/v1.17", "tags": ["x_refsource_MISC"], "url": "https://github.com/containers/fuse-overlayfs/releases/tag/v1.17"}], "affected": [{"vendor": "containers", "product": "fuse-overlayfs", "versions": [{"version": "< 1.17", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-29T16:14:46.724Z"}, "descriptions": [{"lang": "en", "value": "fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17."}], "source": {"advisory": "GHSA-2cc4-p72c-v85h", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-29T17:56:35.819478Z", "id": "CVE-2026-52791", "options": [{"Exploitation": "poc"}, {"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": "2026-07-29T17:56:43.388Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-52791", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-29T17:56:35.819478Z"}}}], "references": [{"url": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-29T17:56:20.786Z"}}], "cna": {"title": "fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)", "source": {"advisory": "GHSA-2cc4-p72c-v85h", "discovery": "UNKNOWN"}, "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 2, "attackVector": "LOCAL", "baseSeverity": "LOW", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE"}}], "affected": [{"vendor": "containers", "product": "fuse-overlayfs", "versions": [{"status": "affected", "version": "< 1.17"}]}], "references": [{"url": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h", "name": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f", "name": "https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/containers/fuse-overlayfs/releases/tag/v1.17", "name": "https://github.com/containers/fuse-overlayfs/releases/tag/v1.17", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-266", "description": "CWE-266: Incorrect Privilege Assignment"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-29T16:14:46.724Z"}}}, "cveMetadata": {"cveId": "CVE-2026-52791", "state": "PUBLISHED", "dateUpdated": "2026-07-29T17:56:43.388Z", "dateReserved": "2026-06-08T18:02:19.731Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-07-29T16:14:46.724Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "fuse-overlayfs", "vendor": "containers", "versions": [{"status": "affected", "version": "< 1.17"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17."}, {"lang": "es", "value": "fuse-overlayfs es una implementaci\u00f3n de overlayfs en FUSE para contenedores sin privilegios de root. Antes de la 1.17, la rama C release-1.x conserva los bits de modo SUID y SGID en main.c durante el manejo de open(O_TRUNC) y truncate en un archivo copiado a la capa superior, permitiendo que un proceso con pocos privilegios deje el archivo de la capa superior con el modo 4777. Este problema est\u00e1 corregido en la versi\u00f3n 1.17."}], "id": "CVE-2026-52791", "lastModified": "2026-10-24T13:10:00.147", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.0, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52791", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-29T17:56:35.819478Z", "version": "2.0.3"}}]}, "published": "2026-07-29T17:16:52.187", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f"}, {"source": "security-advisories@github.com", "url": "https://github.com/containers/fuse-overlayfs/releases/tag/v1.17"}, {"source": "security-advisories@github.com", "url": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-266"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "fuse-overlayfs: fuse-overlayfs: Privilege Escalation Vulnerability via SUID/SGID Bit Preservation", "id": "2508489", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2508489"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-281", "details": ["A flaw was found in fuse-overlayfs, a component used for rootless containers. This vulnerability allows a low-privileged process to retain SUID (Set User ID) and SGID (Set Group ID) permissions on files after they are truncated or opened with the O_TRUNC flag. This can enable a local attacker to manipulate file permissions, potentially leading to privilege escalation within the system."], "mitigation": {"lang": "en:us", "value": "Avoid configuring fuse-overlayfs as the storage mount_program for rootless Podman/Buildah where native overlayfs support is available (this is not the default on supported RHEL releases). Ensure container images do not ship world- or group-writable files with the SUID or SGID bit set. No other mitigation is available prior to upgrading to fuse-overlayfs >= 1.17."}, "name": "CVE-2026-52791", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "fuse-overlayfs", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "container-tools:rhel8/fuse-overlayfs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "fuse-overlayfs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "fuse-overlayfs", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Out of support scope", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-07-29T16:14:46Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52791\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52791\nhttps://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f\nhttps://github.com/containers/fuse-overlayfs/releases/tag/v1.17\nhttps://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h"], "statement": "Red Hat is aware of this issue affecting fuse-overlayfs, which is used as an optional, non-default storage backend for rootless Podman/Buildah on kernels or configurations where native (kernel) overlayfs support for user namespaces is unavailable. On currently supported Red Hat Enterprise Linux releases (RHEL >= 8.5 / RHEL 9 / RHEL 10), rootless Podman uses native kernel overlayfs by default; fuse-overlayfs is only invoked as a fallback or when explicitly configured via storage.conf's mount_program option, or in nested/unprivileged container scenarios (e.g. rootless Buildah image builds) that lack CAP_SYS_ADMIN. Exploitation additionally requires a pre-existing file in the container's lower image layer that already carries the SUID or SGID bit and is writable by a low-privileged process, an atypical container image configuration. Red Hat rates the overall risk of this issue as reduced relative to a generic worst-case rating given these preconditions; see the private triage comment on this flaw for the full reachability and CVSS analysis.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,1.17)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "fuse-overlayfs", "source": "cna", "vendor": "containers"}, "product": "fuse-overlayfs", "vendor": "containers"}], "created": "2026-07-30T14:01:55.795914+00:00", "updated": "2026-08-02T08:00:04.665532+00:00", "vendors": ["containers", "containers$PRODUCT$fuse-overlayfs"]}