CVE-2026-27114

MediumPublic PoC

Published: 19 February 2026

Published

19 February 2026

Modified

26 February 2026

KEV Added

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Patch

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CVSS Score v4 5.1 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Score 0.0004 13.9th percentile

Risk Priority 10 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-27114 is a medium-severity Infinite Loop (CWE-835) vulnerability in M2Team Nanazip. Its CVSS base score is 5.1 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Malicious File (T1204.002); ranked at the 13.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-2 (Flaw Remediation) and RA-5 (Vulnerability Monitoring and Scanning).

Deeper analysis

CVE-2026-27114 affects NanaZip, an open-source file archiving utility, specifically in versions starting from 5.0.1252.0 up to but not including 6.0.1630.0. The vulnerability stems from circular `NextOffset` chains in the ROMFS archive parser, triggering an infinite loop (CWE-835: Loop with Unreachable Exit Condition). This issue has a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating high severity primarily due to availability impact.

Attackers can exploit this remotely over a network with low complexity, requiring no privileges or user interaction beyond convincing a victim to open a malicious ROMFS archive file in an affected NanaZip version. Successful exploitation leads to a denial-of-service condition, as the infinite loop causes the application to hang or crash, consuming excessive CPU resources without impacting confidentiality or integrity.

The GitHub security advisory (GHSA-hfg9-6rf9-5pgx) from the M2Team/NanaZip repository details the issue, confirming that version 6.0.1630.0 includes a patch to resolve the infinite loop. A proof-of-concept exploit is available as a ZIP attachment, demonstrating the vulnerability for testing purposes. Security practitioners should prioritize updating to the patched version and scan for vulnerable installations.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-8315

Vulnerability details

NanaZip is an open source file archive. Starting in version 5.0.1252.0 and prior to version 6.0.1630.0, circular `NextOffset` chains cause an infinite loop in the ROMFS archive parser. Version 6.0.1630.0 patches the issue.

CWE(s): CWE-835

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1204.002 Malicious File Execution

An adversary may rely upon a user opening a malicious file in order to gain execution.

attack.mitre.org →

T1499.004 Application or System Exploitation Impact

Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.

attack.mitre.org →

Why these techniques?

Vulnerability in ROMFS parser enables DoS via crafted archive file opened by victim (T1204.002 Malicious File) resulting in application crash/hang through exploitation (T1499.004 Application or System Exploitation).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1