CVE-2026-59640

UNKNOWN 0.0

OpenPGP CFB quick-check oracle active on symmetric/session-key paths

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

In Bouncy Castle for Java before 1.85, OpenPGP CFB quick-check oracle active on symmetric/session-key paths. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).

CWE	CWE-203
Vendor	legion of the bouncy castle inc.
Product	bc-java
Published	Aug 3, 2026

Stay Ahead of the Next One

Get instant alerts for legion of the bouncy castle inc. bc-java

Be the first to know when new unknown vulnerabilities affecting legion of the bouncy castle inc. bc-java are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

Affected Versions

Legion of the Bouncy Castle Inc. / BC-JAVA

0 < 1.85

Legion of the Bouncy Castle Inc. / BC-LTS-JAVA

2.73.0 < 2.73.12

Legion of the Bouncy Castle Inc. / BC-FJA

1.0.0 < 1.0.13 2.0.0 < 2.0.13 2.1.0 < 2.1.13

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/bcgit/bc-java/wiki/CVE-2026-59640 github.com: https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e

Credits

🔍 Alex Gaynor in collaboration with Claude and Anthropic Research