bit7z: Path Traversal via Null Byte Injection from `gcount()` Off-by-One in `restoreSymlink()`

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Summary

CVECVE-2026-45380
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-10 22:16:58 UTC
Updated2026-06-11 16:16:23 UTC
Descriptionbit7z is a cross-platform C++ static library that allows the compression/extraction of archive files. Prior to version 4.0.12, a one-byte off-by-one error in SafeOutPathBuilder::restoreSymlink() allows an attacker to craft a .7z archive that, when extracted with bit7z on any non-Windows platform, creates a symlink escaping the intended output directory. Subsequent archive entries extracted through this symlink write arbitrary files outside the extraction directory with the permissions of the extracting process. This issue has been patched in version 4.0.12.

Risk And Classification

Primary CVSS: v3.1 3.6 LOW from [email protected]

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

Problem Types: CWE-22 | CWE-193 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | CWE-193 CWE-193: Off-by-one Error

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.6LOWCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L
3.1CNADECLARED3.6LOWCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rikyoz Bit7z affected < 4.0.12 Not specified

References

ReferenceSourceLinkTags
github.com/rikyoz/bit7z/security/advisories/GHSA-8wj8-9jwv-j24v 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/rikyoz/bit7z/releases/tag/v4.0.12 [email protected] github.com
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