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CVE-2026-55780

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7d7aaf5b257fdc02328a7230166f0accc375ee480b8a80fbdca3586a9fe6b916
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ccca39bbb6042d5610d2fdd09a2cda56a3534b03cbfacd95ceb18d02dd8aed6d · sha256:0bd597bd7dc878ee… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ccca39bbb6042d5610d2fdd09a2cda56a3534b03cbfacd95ceb18d02dd8aed6d · sha256:0bd597bd7dc878ee… · /containers/cna/problemTypes/0/descriptions/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:ccca39bbb6042d5610d2fdd09a2cda56a3534b03cbfacd95ceb18d02dd8aed6d · sha256:0bd597bd7dc878ee… · /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:ccca39bbb6042d5610d2fdd09a2cda56a3534b03cbfacd95ceb18d02dd8aed6d · sha256:0bd597bd7dc878ee… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ccca39bbb6042d5610d2fdd09a2cda56a3534b03cbfacd95ceb18d02dd8aed6d · sha256:0bd597bd7dc878ee… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ccca39bbb6042d5610d2fdd09a2cda56a3534b03cbfacd95ceb18d02dd8aed6d · sha256:0bd597bd7dc878ee… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/M2Team/NanaZip/commit/ad62e3b4970b9f01e924c99094d6fed7a42f849a","tags":["x_refsource_MISC"],"url":"https://github.com/M2Team/NanaZip/commit/ad62e3b4970b9f01e924c99094d6fed7a42f849a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ccca39bbb6042d5610d2fdd09a2cda56a3534b03cbfacd95ceb18d02dd8aed6d · sha256:0bd597bd7dc878ee… · /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:ccca39bbb6042d5610d2fdd09a2cda56a3534b03cbfacd95ceb18d02dd8aed6d · sha256:0bd597bd7dc878ee… · /containers/cna/references/2
{"tags":["exploit"],"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-ppm9-5267-rq72"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ccca39bbb6042d5610d2fdd09a2cda56a3534b03cbfacd95ceb18d02dd8aed6d · sha256:0bd597bd7dc878ee… · /containers/adp/0/references/0
{"name":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-ppm9-5267-rq72","tags":["x_refsource_CONFIRM"],"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-ppm9-5267-rq72"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ccca39bbb6042d5610d2fdd09a2cda56a3534b03cbfacd95ceb18d02dd8aed6d · sha256:0bd597bd7dc878ee… · /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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