{"cve":{"cve_id":"CVE-2026-18508","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00141,"epss_percentile":0.03774,"epss_as_of":"2026-09-15","description":"A flaw was found in GNU tar. When extracting an archive with the --one-top-level option, hardlink targets are not confined to the designated top-level directory and may resolve relative to the extraction working directory. A crafted archive can create hardlinks that escape the intended boundary and, when combined with a preexisting symbolic link under the working directory, may allow writing outside that boundary during a single extraction.","published_at":"2026-08-03T14:51:41.340000Z","last_modified_at":"2026-09-10T18:17:57.193000Z","cvss_v3_score":4.4,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"partial","cwes":["CWE-59"],"nvd_references":["https://access.redhat.com/errata/RHSA-2026:50807","https://access.redhat.com/errata/RHSA-2026:61581","https://access.redhat.com/errata/RHSA-2026:61586","https://access.redhat.com/errata/RHSA-2026:61783","https://access.redhat.com/errata/RHSA-2026:66018","https://access.redhat.com/security/cve/CVE-2026-18508","https://bugzilla.redhat.com/show_bug.cgi?id=2509843"],"vuln_status":"Modified","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-08-03T16:18:26.061395Z","updated_at":"2026-09-10T23:39:39.813751Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"gnu","vendor_name":"gnu","product_slug":"tar","product_name":"Tar","version_start":"1.35","version_start_inclusive":true,"version_end":"1.35","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:gnu:tar:1.35:*:*:*:*:*:*:*"},{"vendor_slug":"redhat","vendor_name":"RedHat","product_slug":"enterprise-linux","product_name":"enterprise_linux","version_start":"8.0","version_start_inclusive":true,"version_end":"8.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*"},{"vendor_slug":"redhat","vendor_name":"RedHat","product_slug":"enterprise-linux","product_name":"enterprise_linux","version_start":"9.0","version_start_inclusive":true,"version_end":"9.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*"},{"vendor_slug":"redhat","vendor_name":"RedHat","product_slug":"enterprise-linux","product_name":"enterprise_linux","version_start":"10.0","version_start_inclusive":true,"version_end":"10.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*"},{"vendor_slug":"redhat","vendor_name":"RedHat","product_slug":"openshift-container-platform","product_name":"openshift_container_platform","version_start":"4.0","version_start_inclusive":true,"version_end":"4.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:50807","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:61581","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:61586","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:61783","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:66018","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-18508","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2509843","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-08-03T14:51:41.340000Z","label":"CVE published","source":null}]}