What is CVE-2026-51859?

CVE-2026-51859 is a critical-severity vulnerability in N/a, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-09-30.

How severe is CVE-2026-51859?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Path Traversal in N/a

CVE-2026-51859

bisheng 2.3.0, 2.4.0, and 2.4.0-beta1 is vulnerable to directory traversal in save_download_file (src/backend/bisheng/core/cache/utils.py:290).

Vulnerability class: Path Traversal (Directory Traversal)

Published 2026-09-30 · last modified 2026-10-01.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (24.0th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Weakness classification (CWE)

CWE-22 — Path Traversal

References

Frequently asked questions

What is CVE-2026-51859?: CVE-2026-51859 is a critical-severity vulnerability in N/a, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-09-30.
How severe is CVE-2026-51859?: Critical severity. CVSS v3 base score is 9.1 out of 10.