Vulnerability in Cloud Foundry Foundation Bosh-Windows-Stemcell-Builder

CVE-2026-47831

Use of a cryptographically weak random number generator in the GenerateRandomPassword function in bosh-windows-stemcell-builder allows a remote attacker to brute-force the resulting SSH login via TCP/22. Affected versions: bosh-windows-stemcell-builder versions prior to v2019.98.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (22.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-47831: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

References

Frequently asked questions

What is CVE-2026-47831?
CVE-2026-47831 is a high-severity vulnerability in Cloud Foundry Foundation Bosh-Windows-Stemcell-Builder, classified under CWE-338 USE OF CRYPTOGRAPHICALLY WEAK PSEUDO-RANDOM NUMBER GENERATOR (PRNG). CVSS score: 7.5/10. Published 2026-07-09.
How severe is CVE-2026-47831?
High severity. CVSS v3 base score is 7.5 out of 10.