CVE-2026-27710CWE-191

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

Medium · published February 25, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
3.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
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
EPSS
0.00148 · 3.7th percentile
Weakness
CWE-191 · Integer Underflow (Wrap or Wraparound)
Published
2026-02-25T23:43Z
EPSS history
Timeline
  • 25 FEB 23:43Z
    NanaZip .NET Single-File Parser Integer Underflow Leads to Unbounded Allocation (DoS)
    cvelistv5