CVE-2026-45380
bit7z: Path Traversal via Null Byte Injection from `gcount()` Off-by-One in `restoreSymlink()`
CVSS Score
3.6
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-22 CWE-193 |
| Vendor | rikyoz |
| Product | bit7z |
| Published | Jun 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
Affected Versions
rikyoz / bit7z
< 4.0.12