CVE-2026-45380 LOW

CVE-2026-45380: bit7z: Path Traversal via Null Byte Injection from `gcount()` Off-by-One in `restoreSymlink()`

Vendor Rikyoz
Product bit7z
Weakness CWE-22 · Path traversal
Published June 10, 2026
Last update June 11, 2026
View on NVD All CVEs

CVSS base score

3.6/10
Attack vector Local
Attack complexity High
Privileges required None
User interaction Required
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 10, 2026 CVE published
June 11, 2026 Record updated