CVE-2026-27711 PUBLISHED

NanaZip UFS Archive Parser Memory Corruption via Unvalidated Directory Record Length

Assigner: GitHub_M
Reserved: 23.02.2026 Published: 25.02.2026 Updated: 26.02.2026

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 memory corruption vulnerability in NanaZip’s UFS parser allows a crafted .ufs/.ufs2/.img file to trigger out-of-bounds memory access during archive open/listing. The bug is reachable via normal user file-open flow and can cause process crash, hang, and potentially exploitable heap corruption. 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-rjwv-4w7x-hc9c

Problem Types

CWE-125: Out-of-bounds Read CWE