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CVE-2026-55783

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:1fb6b2cfc17b7a4b25684d1c004f4cb21432d3304b127ceee65c70b1e5250ace
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"NanaZip","vendor":"M2Team","versions":[{"status":"affected","version":"< 6.5.1749.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d2a0f34dc36a954e6ecc2d3a190d2f90997a2fb074ac4995218491ee02a99875 · sha256:47fde299ffaa785f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":2.4,"baseSeverity":"LOW","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","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","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d2a0f34dc36a954e6ecc2d3a190d2f90997a2fb074ac4995218491ee02a99875 · sha256:47fde299ffaa785f… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-476","description":"CWE-476: NULL Pointer Dereference","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d2a0f34dc36a954e6ecc2d3a190d2f90997a2fb074ac4995218491ee02a99875 · sha256:47fde299ffaa785f… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/M2Team/NanaZip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894","tags":["x_refsource_MISC"],"url":"https://github.com/M2Team/NanaZip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d2a0f34dc36a954e6ecc2d3a190d2f90997a2fb074ac4995218491ee02a99875 · sha256:47fde299ffaa785f… · /containers/cna/references/1
{"name":"https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0","tags":["x_refsource_MISC"],"url":"https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d2a0f34dc36a954e6ecc2d3a190d2f90997a2fb074ac4995218491ee02a99875 · sha256:47fde299ffaa785f… · /containers/cna/references/2
{"tags":["exploit"],"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-q67r-9cfh-xc29"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d2a0f34dc36a954e6ecc2d3a190d2f90997a2fb074ac4995218491ee02a99875 · sha256:47fde299ffaa785f… · /containers/adp/0/references/0
{"name":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-q67r-9cfh-xc29","tags":["x_refsource_CONFIRM"],"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-q67r-9cfh-xc29"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d2a0f34dc36a954e6ecc2d3a190d2f90997a2fb074ac4995218491ee02a99875 · sha256:47fde299ffaa785f… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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