Resource exhaustion in Bouncycastle Bc-Java

CVE-2026-58063

In Bouncy Castle for Java before 1.85, BCFKS keystore load honours unbounded KDF cost from untrusted file. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

EPSS: 0.004 (29.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-58063?
CVE-2026-58063 is a medium-severity vulnerability in Bouncycastle Bc-Java, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.3/10. Published 2026-08-03.
How severe is CVE-2026-58063?
Medium severity. CVSS v3 base score is 5.3 out of 10.