{"cve":{"cve_id":"CVE-2026-55780","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":0.00424,"epss_percentile":0.35247,"epss_as_of":"2026-08-26","description":"NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's .NET single-file bundle handler in NanaZip.Codecs.Archive.DotNetSingleFile.cpp sizes its extraction buffer from the bundle entry Size field, which is only checked for sign and is not validated against the real file size. A crafted bundle can cause an attacker-chosen allocation inside Extract, where std::bad_alloc or std::length_error can escape across the COM STDMETHODCALLTYPE boundary and crash the process. This issue is fixed in version 6.5.1749.0.","published_at":"2026-07-10T16:49:26.257000Z","last_modified_at":"2026-07-13T19:17:15.323000Z","cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":2.4,"cvss_v4_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","cvss_v4_severity":"LOW","ssvc_decision":null,"ssvc_exploitation":"poc","ssvc_automatable":false,"ssvc_technical_impact":"partial","cwes":["CWE-248","CWE-400"],"nvd_references":["https://github.com/M2Team/NanaZip/security/advisories/GHSA-ppm9-5267-rq72","https://github.com/M2Team/NanaZip/commit/ad62e3b4970b9f01e924c99094d6fed7a42f849a","https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0"],"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":"2026-07-10T17:33:20.785091Z","updated_at":"2026-07-14T16:32:21.705357Z"},"effective_severity":"LOW","badges":["exploit"],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"AT","name":"Attack Requirements","value":"N","value_label":"None"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"P","value_label":"Passive"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"N","value_label":"None"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"N","value_label":"None"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"L","value_label":"Low"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"N","value_label":"None"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"N","value_label":"None"},{"metric":"SA","name":"Availability (Subsequent System)","value":"N","value_label":"None"}]},"affected":[{"vendor_slug":"m2team","vendor_name":"M2Team","product_slug":"nanazip","product_name":"NanaZip","version_start":"< 6.5.1749.0","version_start_inclusive":true,"version_end":"< 6.5.1749.0","version_end_inclusive":true,"cpe23_uri":"cve5:m2team:nanazip:< 6.5.1749.0:< 6.5.1749.0"}],"exploit_refs":[{"source":"exploit-db","kind":"exploit-db","url":"https://www.exploit-db.com/exploits/52652","title":"NanaZip 6.5  -  DoS","author":"Jorge González Milla","disclosed_at":"2026-08-17"}],"news":[],"references":[{"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-ppm9-5267-rq72","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/M2Team/NanaZip/commit/ad62e3b4970b9f01e924c99094d6fed7a42f849a","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-07-10T16:49:26.257000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-07-13T22:34:20.792709Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-13T22:34:20.792709Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-13T22:34:20.792709Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"exploit_known","at":"2026-08-17T00:00:00Z","label":"Public exploit available","source":"exploit-db"}]}