CVE-2026-8763High· 7.4▾ TwilightIn Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI. 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.…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 40.7 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the vendor's CSAF advisory record, not NVD.
Exploit-prediction probability, daily snapshots since Aug 3.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
7.4 → —
high → none
— → 7.4
none → high
7.4 → —
high → none
— → 7.4
none → high
7.4 → —
high → none
— → 7.4
none → high
0.3% → 0.5%
In Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI. 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).
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
org.bouncycastle:bc-fips < 1.0.2.7org.bouncycastle:bc-fips >= 2.0.0, < 2.0.2org.bouncycastle:bc-fips >= 2.1.0, < 2.1.3org.bouncycastle:bcprov-jdk18on < 1.85org.bouncycastle:bcprov-lts8on < 2.73.12org.bouncycastle:bcprov-jdk15to18 < 1.85Patched in:
org.bouncycastle:bc-fips 1.0.2.7org.bouncycastle:bc-fips 2.0.2org.bouncycastle:bc-fips 2.1.3org.bouncycastle:bcprov-jdk18on 1.85org.bouncycastle:bcprov-lts8on 2.73.12org.bouncycastle:bcprov-jdk15to18 1.85Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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