{"id":"CVE-2026-55783","state":"PUBLISHED","title":"NanaZip: NULL pointer dereference in Extract() of all seven NanaZip custom archive handlers when extracting/testing the whole archive","description":"NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's seven in-house IInArchive handlers in NanaZip.Codecs unconditionally dereference the caller-supplied Indices array inside Extract when the archive engine signals extract everything by passing Indices as NULL and NumItems as 0xFFFFFFFF. This causes a NULL pointer dereference in the standard Test archive or Extract all code path for WebAssembly, ElectronAsar, Zealfs, Romfs, Ufs, Littlefs, and DotNetSingleFile archives, resulting in a process crash. This issue is fixed in version 6.5.1749.0.","publishedAt":"2026-07-10T16:48:29.959Z","updatedAt":"2026-07-10T18:38:45.230Z","severity":{"score":2.4,"label":"Low","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["M2Team NanaZip"],"affected":[{"vendor":"M2Team","product":"NanaZip","versions":[{"version":"< 6.5.1749.0","status":"affected"}]}],"references":["https://github.com/M2Team/NanaZip/security/advisories/GHSA-q67r-9cfh-xc29","https://github.com/M2Team/NanaZip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894","https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55783.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55783","state":"PUBLISHED","datePublished":"2026-07-10T16:48:29.959Z","dateUpdated":"2026-07-10T18:38:45.230Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-17T14:40:28.379Z"},"containers":{"cna":{"title":"NanaZip: NULL pointer dereference in Extract() of all seven NanaZip custom archive handlers when extracting/testing the whole archive","descriptions":[{"lang":"en","value":"NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's seven in-house IInArchive handlers in NanaZip.Codecs unconditionally dereference the caller-supplied Indices array inside Extract when the archive engine signals extract everything by passing Indices as NULL and NumItems as 0xFFFFFFFF. This causes a NULL pointer dereference in the standard Test archive or Extract all code path for WebAssembly, ElectronAsar, Zealfs, Romfs, Ufs, Littlefs, and DotNetSingleFile archives, resulting in a process crash. This issue is fixed in version 6.5.1749.0."}],"affected":[{"vendor":"M2Team","product":"NanaZip","versions":[{"version":"< 6.5.1749.0","status":"affected"}]}],"references":[{"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-q67r-9cfh-xc29","name":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-q67r-9cfh-xc29","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/M2Team/NanaZip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894","name":"https://github.com/M2Team/NanaZip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894","tags":["x_refsource_MISC"]},{"url":"https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0","name":"https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":2.4,"baseSeverity":"LOW","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","description":"CWE-476: NULL Pointer Dereference","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-10T16:48:29.959Z"},"source":{"advisory":"GHSA-q67r-9cfh-xc29","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-q67r-9cfh-xc29","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-10T18:38:42.233516Z","id":"CVE-2026-55783","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-10T18:38:45.230Z"}}]}}}