CVE-2026-55782Public exploit

Service interruption via unbounded WebAssembly length allocations

Published Jul 10, 2026 · Updated Jul 10, 2026

Resource exhaustion in M2-Team NanaZip before 6.5.1749.0 allows local users to interrupt the process with a crafted WebAssembly file. NanaZip.Codecs.Archive.WebAssembly.cpp sizes std::string and vector buffers directly from unvalidated 32-bit NameSize and section-size fields before confirming that those bytes exist. Listing or extracting the crafted file is required and can trigger multi-gigabyte allocations, memory exhaustion, and process termination without reported data disclosure or modification.

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

Resource exhaustion in M2-Team NanaZip before 6.5.1749.0 allows local users to interrupt the process with a crafted WebAssembly file. NanaZip.Codecs.Archive.WebAssembly.cpp sizes std::string and vector buffers directly from unvalidated 32-bit NameSize and section-size fields before confirming that those bytes exist. Listing or extracting the crafted file is required and can trigger multi-gigabyte allocations, memory exhaustion, and process termination without reported data disclosure or modification.

The record

CVE
CVE-2026-55782
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
M2-Team
Product
NanaZip
Classifications
CWE-789, CWE-400, T1499.004
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

2.4GitHubCVSS: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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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-789Memory Allocation with Excessive Size Value
CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

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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