6.5

CVE-2026-59638

JSSE hostname verifier CN-fallback enabled by default despite documented opt-in

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).
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Bouncycastle ≫ Bc-java Version < 1.85
Bouncycastle ≫ Bctls-fips Version >= 1.0.0 < 1.0.24
Bouncycastle ≫ Bctls-fips Version >= 2.0.19 < 2.0.24
Bouncycastle ≫ Bctls-fips Version >= 2.1.20 < 2.1.24
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.28% 0.199
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 6.5 3.9 2.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
91579145-5d7b-4cc5-b925-a0262ff19630 9.3 0 0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber
CWE-297 Improper Validation of Certificate with Host Mismatch

The product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host.

https://github.com/bcgit/bc-java/commit/799bd15320a6310a447863638aa3df64acef829b
Patch
https://github.com/bcgit/bc-java/commit/5ac55351cd1a8a7184d41c96a7ee87df0770240a
Patch
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059638
Third Party Advisory