NanaZip: Heap out-of-bounds read in NanaZip SquashFS LZ4 decompressor via unchecked negative return value

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54616
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-20 17:18:18 UTC
Updated2026-08-20 20:17:34 UTC
DescriptionNanaZip 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

EPSS: 0.003190000 probability, percentile 0.248910000 (date 2026-08-21)

Problem Types: CWE-125 | CWE-125 CWE-125: Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA M2Team NanaZip affected >= 1.0.88.0, < 6.0.1698.0 Not specified
CNA M2Team NanaZip affected >= 6.5.1638.0, < 6.5.1742.0 Not specified

References

ReferenceSourceLinkTags
github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/M2Team/NanaZip/releases/tag/6.5.1742.0 [email protected] github.com
github.com/M2Team/NanaZip/releases/tag/6.0.1698.0 [email protected] github.com
github.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952f [email protected] github.com
github.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956 [email protected] github.com
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