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Fencer Vulns
critical 9.1

CVE-2026-8763 json

Name Constraints bypass via trailing dot in rfc822Name and URI

published 2026-08-03 3 mo ago modified 2026-10-05 35 d ago also GHSA-9pwp-9qqc-pr26 , EUVD-2026-52020

cvss
9.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

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).

Patch / fix

  • maven org.bouncycastle:bc-fips 1.0.2.7, 2.0.2, 2.1.3
  • maven org.bouncycastle:bcprov-jdk18on 1.85
  • maven org.bouncycastle:bcprov-lts8on 2.73.12
  • maven org.bouncycastle:bcprov-jdk15to18 1.85
  • Legion of the Bouncy Castle Inc. BC-JAVA 1.85
  • Legion of the Bouncy Castle Inc. BC-LTS-JAVA 2.73.12
  • Legion of the Bouncy Castle Inc. BC-FJA 1.0.2.7, 2.0.2, 2.1.3
  • bouncycastle Debian 14 1.86-1

debian advisories DEBIAN-CVE-2026-8763

  • bouncycastle SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 1.85-150200.3.38.1
  • bouncycastle SLES 16.0, SLES for SAP applications 16.0 1.85-160000.1.1

suse advisories SUSE-SU-2026:3559-1SUSE-SU-2026:23127-1SUSE-SU-2026:23150-1

  • bouncycastle openSUSE Leap 16.0 1.85-160000.1.1
  • bouncycastle openSUSE Tumbleweed 1.85-1.1

opensuse advisories openSUSE-SU-2026:21538-1openSUSE-SU-2026:11445-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-8763 updated cvss 7.4

org.bouncycastle/bcprov-jdk15on: org.bouncycastle/bcpkix-jdk15on: Bouncy Castle for Java: Name Constraints bypass via trailing dot in rfc822Name and URI

  • Red Hat build of Apache Camel for Spring Boot 4 bcpkix-jdk18on Red Hat build of Apicurio Registry 3 bcpkix-jdk18on
    affected: no fix available
  • Red Hat Ceph Storage 9 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +19 more
    affected: no fix available “Fix deferred”
  • Red Hat Fuse 7 bcpkix-jdk18on Red Hat JBoss Enterprise Application Platform 7 bcpkix-jdk18on, bcprov-jdk15on 1.69, bcpkix-jdk15on 1.68.0.redhat-00005, jboss-eap-7/eap74-els-openjdk8-openshift-rhel8, jboss-eap-7/eap74-els-openjdk11-openshift-rhel8, jboss-eap-7/eap74-els-openjdk17-openshift-rhel8 Red Hat Single Sign-On 7 bcpkix-jdk18on, bcprov-jdk15on 1.69, bcpkix-jdk15on 1.68.0.redhat-00005
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Developer Tools and Services jenkins, jenkins-2-plugins, ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9 Red Hat Ansible Automation Platform 2 ansible-automation-platform-27/de-minimal-rhel9, ansible-automation-platform-27/de-supported-rhel9 Red Hat OpenShift AI (RHOAI) rhoai/odh-modelmesh-rhel9 Red Hat OpenShift Dev Spaces devspaces/openvsx-rhel9, devspaces/jetbrains-ide-rhel9, devspaces/pluginregistry-rhel9 Red Hat Satellite 6 candlepin, candlepin-selinux
    under investigation
  • Red Hat build of Keycloak 26.4 rhbk/keycloak-rhel9 26.4-29, rhbk/keycloak-rhel9-operator 26.4-30, rhbk/keycloak-operator-bundle 26.4.17-2
    fixed: vendor fix RHSA-2026:95760
  • Red Hat build of Keycloak 26.4.17
    fixed: vendor fix RHSA-2026:95759
  • Red Hat build of Keycloak 26.6 rhbk/keycloak-rhel9 26.6-24, rhbk/keycloak-rhel9-operator 26.6-24, rhbk/keycloak-operator-bundle 26.6.8-2
    fixed: vendor fix RHSA-2026:95762
  • Red Hat build of Keycloak 26.6.8
    fixed: vendor fix RHSA-2026:95761
show 5 more
  • Red Hat JBoss Enterprise Application Platform 8.1
    fixed: vendor fix RHSA-2026:95887
  • Red Hat AMQ Broker 7 bcpkix-jdk18on
    not affected: vulnerable code not present
  • Red Hat AMQ Clients bcprov-jdk15on 1.69
    not affected: vulnerable code not in execute path
  • Red Hat build of Apache Camel 4 for Quarkus 3 bcpkix-jdk18on Red Hat build of Quarkus bcpkix-jdk18on Red Hat Enterprise Linux 8 resteasy, resteasy-javadoc
    not affected: vulnerable code not present
  • Red Hat Enterprise Linux 9 resteasy, pki-resteasy-core, pki-resteasy-client, pki-resteasy-jackson2-provider, pki-resteasy-servlet-initializer Red Hat JBoss Enterprise Application Platform Expansion Pack bcpkix-jdk18on
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
3 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 9.3 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/U:Amber
CNA 4.0 9.3 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
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven org.bouncycastle:bc-fips
<1.0.2.7
>=2.0.0, <2.0.2
>=2.1.0, <2.1.3
1.0.2.7
2.0.2
2.1.3
maven org.bouncycastle:bcprov-jdk18on
<1.85
1.85
maven org.bouncycastle:bcprov-lts8on
<2.73.12
2.73.12
maven org.bouncycastle:bcprov-jdk15to18
<1.85
1.85

Affected products

  • Legion of the Bouncy Castle Inc. BC-JAVA
  • Legion of the Bouncy Castle Inc. BC-LTS-JAVA
  • Legion of the Bouncy Castle Inc. BC-FJA

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.