CVE-2026-27710 NanaZip .NET Single-File Parser Integer Underflow Leads to Unbounded Allocation (DoS)
A crafted archive file can cause an integer underflow leading to unbounded memory allocation and denial of service in NanaZip.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-27710?
CVE-2026-27710 is a medium-severity vulnerability in M2Team NanaZip, published on 25 Feb 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-191
Which versions are affected by CVE-2026-27710?
It affects 1 product.
Products include M2team Nanazip.
How do I fix CVE-2026-27710?
No fix has been published for CVE-2026-27710 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-27710 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27710 exists.
Other vulnerabilities in M2Team NanaZip
- CVE-2026-26282 NanaZip has DotNet Single file OOB Heap Read
- CVE-2026-27709 NanaZip .NET Single-File Manifest Parser Vulnerable to Out-of-Bounds Read via Unchecked RelativePathLength
- CVE-2026-27711 NanaZip UFS Archive Parser Memory Corruption via Unvalidated Directory Record Length
- CVE-2026-27014 NanZip has ROMFS Archive Infinite Loop / Stack Overflow
- CVE-2026-27114 NanaZip has ROMFS Archive Infinite Loop
Sources
Also known as GHSA-89qw-8p49-32wf.