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CVE-2026-45380 rikyoz CVE debrief

CVE-2026-45380 is a LOW severity vulnerability in bit7z, a C++ static library for compressing and extracting archive files. An attacker can craft a malicious .7z archive that, when extracted with bit7z on non-Windows platforms, creates a symlink outside the intended output directory. This allows subsequent archive entries to write arbitrary files outside the extraction directory with the permissions of the extracting process. The issue was patched in version 4.0.12.

Vendor
rikyoz
Product
bit7z
CVSS
LOW 3.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-11
Advisory published
2026-06-10
Advisory updated
2026-06-11

Who should care

Users of bit7z library, especially those extracting archives from untrusted sources, should update to version 4.0.12 or later to mitigate this vulnerability.

Technical summary

A one-byte off-by-one error in SafeOutPathBuilder::restoreSymlink() allows an attacker to craft a malicious .7z archive. When extracted on non-Windows platforms, this archive creates a symlink that escapes the intended output directory. Subsequent archive entries can then write arbitrary files outside the extraction directory.

Defensive priority

LOW

Recommended defensive actions

  • Update bit7z to version 4.0.12 or later.
  • Be cautious when extracting archives from untrusted sources.

Evidence notes

CVE-2026-45380 has a CVSS score of 3.6 and is classified as LOW severity. The vulnerability was published on 2026-06-10T22:16:58.207Z and last modified on 2026-06-11T16:16:23.210Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45380 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45380

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-45380 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45380

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.