CVE-2026-27711

NanaZip UFS Archive Parser Memory Corruption via Unvalidated Directory Record Length

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 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.

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-125 Out-of-bounds Read

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-rjwv-4w7x-hc9c

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.