CVE-2026-45380

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

State: Published
Severity: 3.6 Low
Published: Jun 10, 2026
Updated: Jun 11, 2026
Reserved: May 12, 2026

Description

bit7z 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.

Scores

CVSS	Score	Vector	Source
3.1	3.6 Low	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L	GitHub_M

Weaknesses

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

Affected Products

Product	Versions
bit7zrikyoz	< 4.0.12Affected

References

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