CVE-2026-27710

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

State: Published
Severity: 5.1 Medium
Published: Feb 25, 2026
Updated: Feb 26, 2026
Reserved: Feb 23, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	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	GitHub_M

Weaknesses

CWE-191 Integer Underflow (Wrap or Wraparound)

Affected Products

Product	Versions
NanaZipM2Team	>= 5.0.1252.0, < 6.0.1638.0Affected >= 6.1, < 6.5.1638.0Affected

References

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

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