by Kastro
Paper/Archive/CVE-2026-59650

CVE-2026-59650

Legion of the Bouncy Castle Inc. BC-JAVA — MTI/A0 DH agreement exponentiates unvalidated peer value

EPSS 0.3%CVSS 9.3
critical.is priorityof 100
33
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 27.1.271 × 205.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

In Bouncy Castle for Java before 1.85, MTI/A0 DH agreement exponentiates unvalidated peer value. This issue also affects Bouncy Castle for Java LTS before 2.73.12.

Affected

ProductAffectedFixed inSource
BC-JAVA< 1.851.85CNA
BC-LTS-JAVA2.73.0 – < 2.73.122.73.12CNA

Scores by source

bcorg (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber
NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorygithub.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059650patchgithub.com/bcgit/bc-java/commit/daeaae9d7075d04f40812e68671ebf4c777b5148