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CVE-2026-55782 M2Team CVE debrief

CVE-2026-55782 is a memory exhaustion vulnerability in NanaZip's WebAssembly archive handler. Prior to version 6.5.1749.0, NanaZip allocates buffers from attacker-controlled 32-bit section and custom-name length fields without validation, allowing for multi-gigabyte allocations during listing or extraction. This can cause memory exhaustion or process termination. The vulnerability has a CVSS score of 2.4 and is considered Low severity.

Vendor
M2Team
Product
NanaZip
CVSS
LOW 2.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-10
Original CVE updated
2026-07-14
Advisory published
2026-07-10
Advisory updated
2026-07-14

Who should care

Users of NanaZip versions prior to 6.5.1749.0 should update to the latest version to prevent potential memory exhaustion attacks. This includes operators, platform administrators, vulnerability management teams, and security teams who use NanaZip.

Technical summary

NanaZip's WebAssembly archive handler in NanaZip.Codecs.Archive.WebAssembly.cpp allocates buffers from attacker-controlled 32-bit section and custom-name length fields without validating them against the data present in the file. A tiny crafted module can force multi-gigabyte allocations during listing or extraction through NameSize, Information.Size, and std::string or vector allocation paths, causing memory exhaustion or process termination.

Defensive priority

Medium

Recommended defensive actions

  • Update NanaZip to version 6.5.1749.0 or later
  • Restrict access to NanaZip's WebAssembly archive handler
  • Monitor NanaZip logs for suspicious activity
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-10T17:17:00.017Z and has not been modified since then. The NVD entry is currently Deferred. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. The vulnerability affects NanaZip versions prior to 6.5.1749.0.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-55782 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-55782

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-55782 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-55782

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.