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CVE-2026-54616

7.1 · HIGH

NanaZip is the 7-Zip derivative intended for the modern Windows experience.

Published Aug 20, 2026CWE-125EPSS 0.44%

Overview

CVE-2026-54616 is a high-severity vulnerability. It was published on August 20, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

NanaZip is the 7-Zip derivative intended for the modern Windows experience. From version 1.0.88.0 until stable version 6.0.1698.0 and preview version 6.5.1742.0, the Lz4Decode function in NanaZip.Core/SevenZip/CPP/7zip/Archive/SquashfsHandler.cpp rejects only a zero return from LZ4_decompress_safe even though malformed input produces a negative error value. The negative int is converted to the unsigned SizeT destLen and then truncated into outBufWasWrittenSize, causing ReadBlock to trust an attacker-inflated _cachedUnpackBlockSize. During fragment extraction, an attacker-controlled inode Offset can make memcpy read beyond the _cachedBlock heap allocation and place adjacent heap contents in the extracted file, or crash the process. This issue is fixed in stable version 6.0.1698.0 and preview version 6.5.1742.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952fGitHubgithub.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956GitHubgithub.com/M2Team/NanaZip/releases/tag/6.0.1698.0GitHubgithub.com/M2Team/NanaZip/releases/tag/6.5.1742.0GitHubgithub.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfpGitHubgithub.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp

How CyberStrike helps

Frequently asked questions

What is CVE-2026-54616?

CVE-2026-54616 is a high-severity vulnerability. It was published on August 20, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-54616?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-54616?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-54616?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-54616 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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