{"cve":{"cve_id":"CVE-2026-14191","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":0.00437,"epss_percentile":0.36373,"epss_as_of":"2026-08-26","description":"An out-of-bounds heap write exists in the RAR5 recovery-volume (.rev) parser in WinRAR and UnRAR (RecVolumes5::ReadHeader in recvol5.cpp). The RecItems vector is sized only when the first .rev file in a set is processed; subsequent .rev files supply an independent RecNum value that is validated against that file's own TotalCount field but never against the actual size of RecItems. A crafted set of two or more .rev files can therefore write an attacker-controlled 32-bit value (the header's RevCRC field) to RecItems[RecNum] at an attacker-controlled offset up to 65534 * sizeof(RecVolItem) bytes past the allocation, corrupting adjacent heap objects. Triggering requires the victim to run a recovery/test operation on an attacker-supplied .rev set (for example 'unrar t x.part1.rev', WinRAR 'Repair archive', or auto-recovery when extracting a volume set with a missing .rar part). This is the RAR5-path sibling of CVE-2023-40477 (which was fixed in the RAR3 path only in WinRAR 6.23). Fixed in WinRAR / RAR 7.23.","published_at":"2026-07-01T02:41:39.316000Z","last_modified_at":"2026-07-09T06:16:18.380000Z","cvss_v3_score":7.8,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"total","cwes":["CWE-787","CWE-129"],"nvd_references":["https://www.rarlab.com/download.htm","https://nvd.nist.gov/vuln/detail/CVE-2023-40477","https://www.securin.io/zero-days/cve-2026-14191-winrar-unrar-rar5-recovery-volume-rev-out-of-bounds-heap-write-in-recvolumes5-readheader"],"vuln_status":"Deferred","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":"2026-07-01T03:49:41.825459Z","updated_at":"2026-07-10T02:21:00.079548Z"},"effective_severity":"HIGH","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":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"rarlab","vendor_name":"RARLAB","product_slug":"rar","product_name":"RAR","version_start":"0","version_start_inclusive":true,"version_end":"7.23","version_end_inclusive":false,"cpe23_uri":"cve5:rarlab:rar:0:7.23"},{"vendor_slug":"rarlab","vendor_name":"RARLAB","product_slug":"unrar","product_name":"UnRAR","version_start":"0","version_start_inclusive":true,"version_end":"7.21","version_end_inclusive":true,"cpe23_uri":"cve5:rarlab:unrar:0:7.21"},{"vendor_slug":"rarlab","vendor_name":"RARLAB","product_slug":"unrar.dll","product_name":"UnRAR.dll","version_start":"0","version_start_inclusive":true,"version_end":"7.23","version_end_inclusive":false,"cpe23_uri":"cve5:rarlab:unrar.dll:0:7.23"},{"vendor_slug":"rarlab","vendor_name":"RARLAB","product_slug":"winrar","product_name":"WinRAR","version_start":"0","version_start_inclusive":true,"version_end":"7.23","version_end_inclusive":false,"cpe23_uri":"cve5:rarlab:winrar:0:7.23"}],"exploit_refs":[],"news":[],"references":[{"url":"https://www.rarlab.com/download.htm","source_type":"MISC","tags":[]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-40477","source_type":"CONFIRM","tags":[]},{"url":"https://www.securin.io/zero-days/cve-2026-14191-winrar-unrar-rar5-recovery-volume-rev-out-of-bounds-heap-write-in-recvolumes5-readheader","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-07-01T02:41:39.316000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-07-01T14:23:34.989359Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-01T14:23:34.989359Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-01T14:23:34.989359Z","label":"SSVC decision revised","source":"vulnrichment"}]}