Vulnerability · Published Feb 19, 2026 · Assigned by GitHub_M

CVE-2026-26282NanaZip has DotNet Single file OOB Heap Read

Medium 5.2

In plain English

A medium-severity security flaw in NanaZip from M2Team. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 4.0)5.2Medium

Exploit odds (30 days)0.2%top 89.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

NanaZip is an open source file archive Starting in version 5.0.1252.0 and prior to version 6.0.1630.0, NanaZip has an out-of-bounds heap read in `.NET Single File` bundle header parser due to missing bounds check. Opening a crafted file with NanaZip causes a crash or leaks heap data to the user. Version 6.0.1630.0 patches the issue.

Affected products (as reported)

Vendor	Product	Versions
M2Team	NanaZip	>= 5.0.1252.0, < 6.0.1630.0

Weakness: CWE-126 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

References

https://github.com/M2Team/NanaZip/security/advisories/GHSA-ccpc-2222-xv5c x_refsource_CONFIRM
https://github.com/user-attachments/files/25274143/poc.exe.zip x_refsource_MISC