CVE-2026-27710 PUBLISHED

NanaZip .NET Single-File Parser Integer Underflow Leads to Unbounded Allocation (DoS)

Assigner: GitHub_M
Reserved: 23.02.2026 Published: 25.02.2026 Updated: 25.02.2026

NanaZip is an open source file archive. Starting in version 5.0.1252.0 and prior to versions 6.0.1638.0 and 6.5.1638.0, a denial-of-service vulnerability exists in NanaZip’s .NET Single File Application parser. A crafted bundle can force an integer underflow in header-size calculation and trigger an unbounded memory allocation attempt during archive open. Versions 6.0.1638.0 and 6.5.1638.0 fix the issue.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 5.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	Low
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	M2Team
Product	NanaZip
Versions	Version >= 5.0.1252.0, < 6.0.1638.0 is affected Version >= 6.1, < 6.5.1638.0 is affected

References

https://github.com/M2Team/NanaZip/security/advisories/GHSA-89qw-8p49-32wf

Problem Types

CWE-191: Integer Underflow (Wrap or Wraparound) CWE