TI-2026-67475 Aliases CVE-2026-71888 GHSA-j453-27jp-4cph

CMS AuthenticatedData exposes attacker-inserted authAttrs when digestAlgorithm is absent

MEDIUM 42CWE-354Published 2026-10-03 · Updated 2026-10-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: Partial Red Hat: 11 fixed, 3 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

In Bouncy Castle for Java before 1.86, the streaming CMS AuthenticatedData parser accepted a message whose digestAlgorithm and authAttrs fields disagreed about whether authenticated attributes were present. RFC 5652 sec. 9.1 pairs the two, requiring that authAttrs be present whenever digestAlgorithm is, and sec. 9.2 makes the MAC cover the DER encoding of authAttrs when they are present and the eContent OCTET STRING directly when they are not. CMSAuthenticatedDataParser has to choose between those two in its constructor, before it can reach authAttrs, which comes later in the SEQUENCE, so it chose on digestAlgorithm alone: for a message with digestAlgorithm absent but authAttrs present it verified the content MAC and then returned the attributes through getAuthAttrs() as though they had been authenticated, when the MAC had never covered them. An attacker able to modify a message in transit could insert an authenticated attribute, such as an RFC 2634 ESSSecurityLabel, into an otherwise valid message while holding neither the key-encryption key nor the content-MAC key, and an application taking an authorization, routing or labelling decision from those attributes would act on attacker-chosen values. The content itself remained MAC-bound. asn1.cms.AuthenticatedData now rejects the mismatched pairing when parsing and CMSAuthenticatedDataParser cross-checks the two fields once authAttrs is read. This is a variant of CVE-2026-59642, which bound the content to the MAC for messages that legitimately carry authAttrs, and which does not address this case. This issue also affects Bouncy Castle for Java LTS before 2.73.13, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series), and bcutil-fips 2.0.8 (2.0.X series) and 2.1.8 (2.1.X series).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00112 1st percentileScored 2026-11-07

Fix Partial BC-JAVA (Legion of the Bouncy Castle Inc.): 1.86BC-LTS-JAVA (Legion of the Bouncy Castle Inc.): 2.73.13+1 more productRed Hat: 11 advisoriesRed Hat: 11 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Legion of the Bouncy Castle Inc.	BC-JAVA	before 1.86	1.86	Patch available	CNA
Legion of the Bouncy Castle Inc.	BC-JAVA	1.70 to before 1.86	1.86	Patch available	CNA
Legion of the Bouncy Castle Inc.	BC-LTS-JAVA	2.73.0 to before 2.73.13	2.73.13	Patch available	CNA
Legion of the Bouncy Castle Inc.	BC-LTS-JAVA	2.73.0 to before 2.73.13	2.73.13	Patch available	CNA
Legion of the Bouncy Castle Inc.	BC-FJA	1.0.0 to before 1.0.13; 2.0.0 to before 2.0.13; 2.1.0 to before 2.1.13	1.0.13, 2.0.13, 2.1.13	Patch available	CNA
Legion of the Bouncy Castle Inc.	BC-FJA	2.0.0 to before 2.0.8; 2.1.0 to before 2.1.8	2.0.8, 2.1.8	Patch available	CNA

BC-JAVA VendorLegion of the Bouncy Castle Inc. Affected before 1.86 Fixed in 1.86 Patch available CNA
BC-JAVA VendorLegion of the Bouncy Castle Inc. Affected 1.70 to before 1.86 Fixed in 1.86 Patch available CNA
BC-LTS-JAVA VendorLegion of the Bouncy Castle Inc. Affected 2.73.0 to before 2.73.13 Fixed in 2.73.13 Patch available CNA
BC-LTS-JAVA VendorLegion of the Bouncy Castle Inc. Affected 2.73.0 to before 2.73.13 Fixed in 2.73.13 Patch available CNA
BC-FJA VendorLegion of the Bouncy Castle Inc. Affected 1.0.0 to before 1.0.13; 2.0.0 to before 2.0.13; 2.1.0 to before 2.1.13 Fixed in 1.0.13, 2.0.13, 2.1.13 Patch available CNA
BC-FJA VendorLegion of the Bouncy Castle Inc. Affected 2.0.0 to before 2.0.8; 2.1.0 to before 2.1.8 Fixed in 2.0.8, 2.1.8 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:bouncycastle:bc-java::::::::	—	—	Legion of the Bouncy Castle Inc.

cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:* Versions — — ·Legion of the Bouncy Castle Inc.

Remediation

Fix · CNA BC-JAVA (Legion of the Bouncy Castle Inc.) Fixed in 1.86
Fix · CNA BC-JAVA (Legion of the Bouncy Castle Inc.) Fixed in 1.86
Fix · CNA BC-LTS-JAVA (Legion of the Bouncy Castle Inc.) Fixed in 2.73.13
Fix · CNA BC-LTS-JAVA (Legion of the Bouncy Castle Inc.) Fixed in 2.73.13
Fix · CNA BC-FJA (Legion of the Bouncy Castle Inc.) Fixed in 1.0.13, 2.0.13, 2.1.13
Fix · CNA BC-FJA (Legion of the Bouncy Castle Inc.) Fixed in 2.0.8, 2.1.8

Red Hat 11 advisories

RHSA-2026:88159 Released 2026-10-22 · Red Hat rating Critical
Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.17 security update.
- OpenShift Developer Tools and Services 4.17 registry.redhat.io/ocp-tools-4/jenkins-rhel9
RHSA-2026:88158 Released 2026-10-22 · Red Hat rating Critical
Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.19 security update.
- OpenShift Developer Tools and Services 4.19 registry.redhat.io/ocp-tools-4/jenkins-rhel9
RHSA-2026:88157 Released 2026-10-22 · Red Hat rating Critical
Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.20 security update.
- OpenShift Developer Tools and Services 4.20 registry.redhat.io/ocp-tools-4/jenkins-rhel9

Show 8 more Red Hat advisories

RHSA-2026:88156 Released 2026-10-22 · Red Hat rating Critical
Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.16 security update.
- OpenShift Developer Tools and Services 4.16 registry.redhat.io/ocp-tools-4/jenkins-rhel9
RHSA-2026:88155 Released 2026-10-22 · Red Hat rating Critical
Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.21 security update.
- OpenShift Developer Tools and Services 4.21 registry.redhat.io/ocp-tools-4/jenkins-rhel9
RHSA-2026:88154 Released 2026-10-22 · Red Hat rating Critical
Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.22 security update.
- OpenShift Developer Tools and Services 4.22 registry.redhat.io/ocp-tools-4/jenkins-rhel9
RHSA-2026:88153 Released 2026-10-22 · Red Hat rating Critical
Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.18 security update.
- OpenShift Developer Tools and Services 4.18 registry.redhat.io/ocp-tools-4/jenkins-rhel9
RHSA-2026:88151 Released 2026-10-22 · Red Hat rating Critical
Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.14 security update.
- OpenShift Developer Tools and Services 4.14 registry.redhat.io/ocp-tools-4/jenkins-rhel8
RHSA-2026:88152 Released 2026-10-22 · Red Hat rating Critical
Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.12 security update.
- OpenShift Developer Tools and Services 4.12 registry.redhat.io/ocp-tools-4/jenkins-rhel8
RHSA-2026:88149 Released 2026-10-22 · Red Hat rating Critical
Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.13 security update.
- OpenShift Developer Tools and Services 4.13 registry.redhat.io/ocp-tools-4/jenkins-rhel8
RHSA-2026:88150 Released 2026-10-22 · Red Hat rating Critical
Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.15 security update.
- OpenShift Developer Tools and Services 4.15 registry.redhat.io/ocp-tools-4/jenkins-rhel8

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-03
Legion of the Bouncy Castle BC-JAVA 1.86
11 records Highest priority Priority MEDIUM 4 MEDIUM, 7 LOW
Other records, highest priority first
- TI-2026-67477 MLS external commit can remove an arbitrary group memberPriority MEDIUM 43
- TI-2026-67476 PKIXCertPathReviewer does not apply X.509 name constraints to the target certificatePriority MEDIUM 43
- TI-2026-67472 MLS X.509 credential not bound to the LeafNode signature keyPriority MEDIUM 41
Show all 11 records →
Release · 2026-10-03
Legion of the Bouncy Castle BC-LTS-JAVA 2.73.13
5 records Highest priority Priority MEDIUM 2 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2026-67476 PKIXCertPathReviewer does not apply X.509 name constraints to the target certificatePriority MEDIUM 43
- TI-2026-67480 OpenPGP message truncation not reported, bypassing the SEIPDv1 integrity checkPriority LOW 35
- TI-2026-67471 Native AES packet cipher returns the raw AES key on an aliasPriority LOW 35
Show all 5 records →

Show 1 more group

Release · 2026-10-03
Legion of the Bouncy Castle BC-FJA 1.0.13, 2.0.13, 2.1.13
2 records Highest priority Priority MEDIUM 2 MEDIUM
Other records, highest priority first
- TI-2026-67476 PKIXCertPathReviewer does not apply X.509 name constraints to the target certificatePriority MEDIUM 43
Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Ansible Automation Platform 2	Affected	No fix yet
Red Hat OpenShift AI (RHOAI)	Affected	No fix yet
Red Hat OpenShift Dev Spaces	Affected	No fix yet
OpenShift Developer Tools and Services 4.12	Fixed	RHSA-2026:88152
OpenShift Developer Tools and Services 4.13	Fixed	RHSA-2026:88149
OpenShift Developer Tools and Services 4.14	Fixed	RHSA-2026:88151
OpenShift Developer Tools and Services 4.15	Fixed	RHSA-2026:88150
OpenShift Developer Tools and Services 4.16	Fixed	RHSA-2026:88156
OpenShift Developer Tools and Services 4.17	Fixed	RHSA-2026:88159
OpenShift Developer Tools and Services 4.18	Fixed	RHSA-2026:88153
OpenShift Developer Tools and Services 4.19	Fixed	RHSA-2026:88158
OpenShift Developer Tools and Services 4.20	Fixed	RHSA-2026:88157
OpenShift Developer Tools and Services 4.21	Fixed	RHSA-2026:88155
OpenShift Developer Tools and Services 4.22	Fixed	RHSA-2026:88154

Not affected: 27 products

OpenShift Developer Tools and Services
OpenShift Developer Tools and Services 4.12
OpenShift Developer Tools and Services 4.13
OpenShift Developer Tools and Services 4.14
OpenShift Developer Tools and Services 4.15
OpenShift Developer Tools and Services 4.16
OpenShift Developer Tools and Services 4.17
OpenShift Developer Tools and Services 4.18
OpenShift Developer Tools and Services 4.19
OpenShift Developer Tools and Services 4.20
OpenShift Developer Tools and Services 4.21
OpenShift Developer Tools and Services 4.22
Red Hat AMQ Broker 7
Red Hat Ansible Automation Platform 2
Red Hat Build of Keycloak
Red Hat Ceph Storage 9
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat Fuse 7
Red Hat JBoss Enterprise Application Platform 7
Red Hat JBoss Enterprise Application Platform 8
Red Hat JBoss Enterprise Application Platform Expansion Pack
Red Hat Satellite 6
Red Hat Single Sign-On 7
Red Hat build of Apache Camel 4 for Quarkus 3
Red Hat build of Apache Camel for Spring Boot 4
Red Hat build of Quarkus

Timeline

2026-10-03 Threatist record created from CVE-2026-71888
2026-10-03 Alias added: GHSA-j453-27jp-4cph
2026-10-04 Priority changed: MEDIUM → LOW
2026-10-05 CISA SSVC decision points changed
2026-10-05 Priority changed: LOW → MEDIUM
2026-10-15 Affected versions changed · Red Hat
2026-10-15 CVSS score added · Red Hat
2026-10-16 Affected versions changed · Red Hat
2026-10-23 Fix available: RHSA-2026:88149 · Red Hat
2026-10-23 Fix available: RHSA-2026:88152 · Red Hat
2026-10-23 Fix available: RHSA-2026:88150 · Red Hat
2026-10-23 Fix available: RHSA-2026:88156 · Red Hat
2026-10-23 Fix available: RHSA-2026:88153 · Red Hat
2026-10-23 Fix available: RHSA-2026:88154 · Red Hat
2026-10-23 Fix available: RHSA-2026:88157 · Red Hat
2026-10-23 Fix available: RHSA-2026:88155 · Red Hat
2026-10-23 Fix available: RHSA-2026:88151 · Red Hat
2026-10-23 Fix available: RHSA-2026:88158 · Red Hat
2026-10-23 Fix available: RHSA-2026:88159 · Red Hat
2026-10-23 Fix available: OpenShift Developer Tools and Services 4.12, OpenShift Developer Tools and Services 4.13, OpenShift Developer Tools and Services 4.14 +8 · Red Hat

References

Patch 1

https://github.com/bcgit/bc-java/commit/dcb683b32b440f1beb1d2276a34930164281fb95

Advisory 1

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9071888

TI-2018-15967 Legion of the Bouncy Castle Legion of the Bouncy Castle Java Cryptography APIs 1.58 up to… CVSS 3.1CRITICAL 9.8
TI-2017-09736 BouncyCastle JCE TLS Bleichenbacher/ROBOT CVSS 3.0HIGH 7.5
TI-2026-42545 MTI/A0 DH agreement exponentiates unvalidated peer value CVSS 4.0CRITICAL 9.3
TI-2026-42533 JSSE hostname verifier CN-fallback enabled by default despite documented opt-in CVSS 4.0CRITICAL 9.3
TI-2026-41816 Stapled OCSP response accepted without binding to the checked certificate CVSS 4.0CRITICAL 9.3
TI-2026-07701 Name Constraints bypass via trailing dot in rfc822Name and URI CVSS 4.0CRITICAL 9.3

See all 109 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences