{"id":"CVE-2026-55780","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-55780","generatedAt":"2026-10-28T04:45:04.376Z","title":"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.","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":"2026-07-10T17:17:00.000Z","lastModified":"2026-10-25T15:10:00.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":2.4,"severity":"LOW","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-248","CWE-400"],"affected":[],"epss":{"score":0.0056,"percentile":0.46419,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2026-08-17","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":52652,"kind":"exploit","title":"NanaZip 6.5  -  DoS","url":"https://www.exploit-db.com/exploits/52652","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/windows/dos/52652.txt","file":"exploits/windows/dos/52652.txt","published":"2026-08-17","added":"2026-08-17","updated":"2026-08-17","author":"Jorge González Milla","type":"dos","platform":"windows","port":null,"verified":false,"codes":["CVE-2026-55780"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"high","text":"A public exploit is published in Exploit-DB, so the technical barrier is gone even though the severity is low and EPSS is 0.6%. Treat it as high on anything reachable from the internet."},"changes":[],"references":[{"url":"https://github.com/M2Team/NanaZip/commit/ad62e3b4970b9f01e924c99094d6fed7a42f849a","source":"security-advisories@github.com"},{"url":"https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0","source":"security-advisories@github.com"},{"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-ppm9-5267-rq72","source":"security-advisories@github.com"},{"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-ppm9-5267-rq72","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55780","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}