CVE-2026-45380
CVE-2026-45380 is a low-severity vulnerability with a CVSS 3.x base score of 3.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.
Key facts
- Severity: Low (CVSS 3.x base score 3.6)
- EPSS exploit prediction: 0% (2nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-36116
- Weakness: CWE-22
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-45380?
- 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.
- How severe is CVE-2026-45380?
- CVE-2026-45380 has a CVSS 3.x base score of 3.6, rated low severity. It is exploitable over local access with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability low.
- Is CVE-2026-45380 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-45380?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-45380 have an EU (EUVD) identifier?
- Yes. CVE-2026-45380 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36116.
- When was CVE-2026-45380 published?
- CVE-2026-45380 was published on 2026-06-10 and last updated on 2026-06-17.
References
- https://github.com/rikyoz/bit7z/releases/tag/v4.0.12
- https://github.com/rikyoz/bit7z/security/advisories/GHSA-8wj8-9jwv-j24v
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