Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-55781

NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's UFS and FFS image handler in NanaZip.Codecs.Archive.Ufs.cpp validates the superblock block size only against the MINBSIZE lower bound and does not validate the fs_fsize fragment size, allowing attacker-controlled 32-bit fields to flow into indirect-block, directory, and extraction buffer allocations. A tiny crafted UFS image can force multi-gigabyte allocations during open or extraction, ca
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:dff094947c5419c8370aa5d787b52a65b92dac47572a4fe4187bd6da769d6027
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:v2:626ea28db5712f6719a89187a6c70cccd22a88bdd008590d84fc5e16d18378cc · sha256:7e77015b9cd5d1fa… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-789","description":"CWE-789: Memory Allocation with Excessive Size Value","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:626ea28db5712f6719a89187a6c70cccd22a88bdd008590d84fc5e16d18378cc · sha256:7e77015b9cd5d1fa… · /containers/cna/problemTypes/1/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:v2:626ea28db5712f6719a89187a6c70cccd22a88bdd008590d84fc5e16d18378cc · sha256:7e77015b9cd5d1fa… · /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:v2:626ea28db5712f6719a89187a6c70cccd22a88bdd008590d84fc5e16d18378cc · sha256:7e77015b9cd5d1fa… · /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:v2:626ea28db5712f6719a89187a6c70cccd22a88bdd008590d84fc5e16d18378cc · sha256:7e77015b9cd5d1fa… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-789","description":"CWE-789: Memory Allocation with Excessive Size Value","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:626ea28db5712f6719a89187a6c70cccd22a88bdd008590d84fc5e16d18378cc · sha256:7e77015b9cd5d1fa… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/M2Team/NanaZip/commit/6415b6bff70bc9c486b49cbbc1982724c67f8338","tags":["x_refsource_MISC"],"url":"https://github.com/M2Team/NanaZip/commit/6415b6bff70bc9c486b49cbbc1982724c67f8338"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:626ea28db5712f6719a89187a6c70cccd22a88bdd008590d84fc5e16d18378cc · sha256:7e77015b9cd5d1fa… · /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:v2:626ea28db5712f6719a89187a6c70cccd22a88bdd008590d84fc5e16d18378cc · sha256:7e77015b9cd5d1fa… · /containers/cna/references/2
{"name":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-m34h-jf84-m74h","tags":["x_refsource_CONFIRM"],"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-m34h-jf84-m74h"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:626ea28db5712f6719a89187a6c70cccd22a88bdd008590d84fc5e16d18378cc · sha256:7e77015b9cd5d1fa… · /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.

← Back to CVE Explorer