CVE-2026-55781Public exploit

Process crash via unbounded UFS allocations

Published Jul 10, 2026 · Updated Jul 10, 2026

Uncontrolled resource consumption in NanaZip before 6.5.1749.0 allows local users to crash the process with a crafted UFS image. The UFS/FFS handler in NanaZip.Codecs.Archive.Ufs.cpp accepts unbounded fs_bsize and unchecked fs_fsize fields, then uses derived sizes for indirect-block, directory, and extraction buffers. Browsing or extracting the image is sufficient to trigger multi-gigabyte allocation attempts, causing memory exhaustion or process termination.

CVSS severity2.4
Low
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in NanaZip before 6.5.1749.0 allows local users to crash the process with a crafted UFS image. The UFS/FFS handler in NanaZip.Codecs.Archive.Ufs.cpp accepts unbounded fs_bsize and unchecked fs_fsize fields, then uses derived sizes for indirect-block, directory, and extraction buffers. Browsing or extracting the image is sufficient to trigger multi-gigabyte allocation attempts, causing memory exhaustion or process termination.

The record

CVE
CVE-2026-55781
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
M2-Team
Product
NanaZip
Classifications
CWE-400, CWE-789
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 6.5.1749.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

M2-Team · NanaZipversion=< 6.5.1749.0

Published CVSS scores

2.4M2-Team GitHub Security AdvisoryCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-789Memory Allocation with Excessive Size Value

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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