What is CVE-2023-31582?

CVE-2023-31582 is a high-severity vulnerability in Jose4j Project, classified under Insufficient Entropy. CVSS score: 7.5/10. Published 2023-10-25.

How severe is CVE-2023-31582?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Jose4j Project

CVE-2023-31582

jose4j before v0.9.3 allows attackers to set a low iteration count of 1000 or less.

Published 2023-10-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (49.9th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: -0.000

Affected products

Jose4j Project

Weakness classification (CWE)

CWE-331 — Insufficient Entropy

References

bitbucket.org/b_c/jose4j/issues/203/insecure-support-of-setting-pbe-less-then (Issue Tracking)
github.com/KANIXB/JWTIssues/blob/main/jose4j issue.md (Third Party Advisory)

Frequently asked questions

What is CVE-2023-31582?: CVE-2023-31582 is a high-severity vulnerability in Jose4j Project, classified under Insufficient Entropy. CVSS score: 7.5/10. Published 2023-10-25.
How severe is CVE-2023-31582?: High severity. CVSS v3 base score is 7.5 out of 10.