What is the CVSS score of CVE-2026-27711?

CVE-2026-27711 has a CVSS 3.1 base score of 6.6 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Nanazip are affected by CVE-2026-27711?

Organizations using version 5.0.1252.0 and should be aware of notable risk from CVE-2026-27711, a out-of-bounds read vulnerability rated CVSS 6.6.

Is there a public PoC exploit available for CVE-2026-27711?

Yes, a public proof-of-concept exploit is available for CVE-2026-27711. Prioritise patching immediately. EPSS: 0.0%.

Nanazip CVE-2026-27711

MEDIUM

Out-of-bounds Read (CWE-125)

2026-02-26 security-advisories@github.com

Memory Corruption Denial Of Service Nanazip

6.6

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.6 MEDIUM

AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 27, 2026 - 17:51 vuln.today

Public exploit code

CVE Published

Feb 26, 2026 - 00:16 nvd

MEDIUM 6.6

DescriptionGitHub Advisory

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.

AnalysisAI

NanaZip versions 5.0.1252.0 through 6.5.1637.0 contain an out-of-bounds memory access flaw in the UFS file parser that can be triggered by opening a malicious .ufs/.ufs2/.img archive file, potentially causing process crashes, hangs, or exploitable heap corruption. Local attackers can exploit this vulnerability through normal file-open operations without elevated privileges, and public exploit code is available. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 6.6 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker could exploit this vulnerability to compromise the affected system.
Remediation	Monitor vendor advisories for a patch. Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems running version 5.0.1252.0 and and apply vendor patches as part of regular patch cycle. …

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CVE-2026-27711 vulnerability details – vuln.today

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