Search/CVE-2026-59638
● CVE — Medium

CVE-2026-59638

VendorbouncycastleProductbc-java, bouncy castle for java lts, bctls-fipsDiscoveredAug 3, 2026UpdatedAug 28, 2026

In Bouncy Castle for Java before 1.85, JSSE hostname verifier CN-fallback enabled by default despite documented opt-in. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).

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CVSS v3.1
6.5 MEDIUM
EPSS
0.34%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Aug 26, 2026 → Sep 25, 2026
▲ 0.05pp
0.29% → 0.34% over 3 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
ConfidentialityLOW
IntegrityLOW
AvailabilityNONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Connections
4 relationships
Timeline
disclosure → media coverage
Aug 3, 2026
Disclosure — published as a CVE record. · last revised by NVD Aug 28, 2026