Upstream information

CVE-2026-71892 at MITRE

Description

In Bouncy Castle for Java before 1.86, the opt-in key-size validation on CMS key-transport recipients, org.bouncycastle.cms.jcajce.JceKeyTransRecipient.setKeySizeValidation(true), never ran for a message using RFC 9709 content-encryption key derivation (id-alg-cek-hkdf-sha256). The branch that should have selected the actual content-encryption algorithm carried in the key derivation AlgorithmIdentifier's parameters compared the encrypted-key byte array against the id-alg-cek-hkdf-sha256 object identifier, a comparison between a byte array and an ASN1ObjectIdentifier that is false for every possible input, so the check fell through to a key-size lookup on the outer wrapper OID. That OID identifies a key-derivation construction rather than a cipher and has no registered key size, so the size comparison was skipped entirely. A key-transport EnvelopedData or AuthEnvelopedData whose transported, HKDF-derived content-encryption key did not match the key size of the advertised content-encryption algorithm was therefore accepted even with validation explicitly enabled, silently defeating the only mechanism the API offers for enforcing recovered key size. The recipient now dispatches on the content-encryption AlgorithmIdentifier's algorithm OID, so validation checks the recovered key against the inner content-encryption algorithm. Messages with a matching key size, non-HKDF messages, and recipients that do not enable validation are unaffected. This issue also affects Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having moderate severity.

CVSS v3 Scores
CVSS detail SUSE
Base Score 4.8
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact Low
Integrity Impact Low
Availability Impact None
CVSSv3 Version 3.1
CVSS v4 Scores
CVSS detail CNA (91579145-5d7b-4cc5-b925-a0262ff19630) SUSE
Base Score 6.9 6.3
Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/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 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Attack Vector Network Network
Attack Complexity Low Low
Attack Requirements None Present
Privileges Required None None
User Interaction None None
Vulnerable System Confidentiality Impact Low Low
Vulnerable System Integrity Impact Low Low
Vulnerable System Availability Impact None None
Subsequent System Confidentiality Impact None None
Subsequent System Integrity Impact None None
Subsequent System Availability Impact None None
CVSSv4 Version 4.0 4.0
SUSE Bugzilla entry: 1284221 [IN_PROGRESS]

No SUSE Security Announcements cross referenced.

List of packages in QA

Product(s) Package(s)
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Module for Development Tools 15 SP7
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Server 15 SP7
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Desktop 15 SP7
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Server 15 SP4-LTSS
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Server 15 SP4-LTSS
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Server 15 SP5-LTSS
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Server 15 SP5-LTSS
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Server 15 SP6-LTSS
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Server 15 SP6-LTSS
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Server for SAP Applications 15 SP4
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Server for SAP Applications 15 SP5
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1
SUSE Linux Enterprise Server for SAP Applications 15 SP6
  • bouncycastle >= 1.86-150200.3.41.1
  • bouncycastle-pg >= 1.86-150200.3.41.1
  • bouncycastle-pkix >= 1.86-150200.3.41.1
  • bouncycastle-util >= 1.86-150200.3.41.1

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Desktop 15 SP7 bouncycastle In progress
SUSE Linux Enterprise Module for Development Tools 15 SP7 bouncycastle In progress
SUSE Linux Enterprise Server 15 SP7 bouncycastle In progress
SUSE Linux Enterprise Server 16.0 bouncycastle Affected
SUSE Linux Enterprise Server 16.1 bouncycastle Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 bouncycastle In progress
SUSE Linux Enterprise Server for SAP applications 16.0 bouncycastle Affected
SUSE Linux Enterprise Server for SAP applications 16.1 bouncycastle Affected
openSUSE Leap 16.0 bouncycastle Affected
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS bouncycastle In progress
SUSE Linux Enterprise High Performance Computing 15 SP5 bouncycastle Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS bouncycastle In progress
SUSE Linux Enterprise Module for Development Tools 15 SP4 bouncycastle Affected
SUSE Linux Enterprise Module for Development Tools 15 SP5 bouncycastle Affected
SUSE Linux Enterprise Module for Development Tools 15 SP6 bouncycastle Affected
SUSE Linux Enterprise Server 15 SP4 bouncycastle Affected
SUSE Linux Enterprise Server 15 SP4-LTSS bouncycastle In progress
SUSE Linux Enterprise Server 15 SP5 bouncycastle Affected
SUSE Linux Enterprise Server 15 SP5-LTSS bouncycastle In progress
SUSE Linux Enterprise Server 15 SP6 bouncycastle Affected
SUSE Linux Enterprise Server 15 SP6-LTSS bouncycastle In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP4 bouncycastle In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP5 bouncycastle In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP6 bouncycastle In progress
Products past their end of life and not receiving proactive updates anymore.
SUSE Enterprise Storage 7 bouncycastle Affected
SUSE Enterprise Storage 7.1 bouncycastle Affected
SUSE Linux Enterprise Desktop 15 SP2 bouncycastle Affected
SUSE Linux Enterprise Desktop 15 SP3 bouncycastle Affected
SUSE Linux Enterprise Desktop 15 SP4 bouncycastle Affected
SUSE Linux Enterprise Desktop 15 SP5 bouncycastle Affected
SUSE Linux Enterprise Desktop 15 SP6 bouncycastle Affected
SUSE Linux Enterprise High Performance Computing 15 SP2 bouncycastle Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS bouncycastle Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS bouncycastle Affected
SUSE Linux Enterprise High Performance Computing 15 SP3 bouncycastle Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS bouncycastle Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS bouncycastle Affected
SUSE Linux Enterprise High Performance Computing 15 SP4 bouncycastle Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS bouncycastle In progress
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS bouncycastle In progress
SUSE Linux Enterprise Module for Development Tools 15 SP2 bouncycastle Affected
SUSE Linux Enterprise Module for Development Tools 15 SP3 bouncycastle Affected
SUSE Linux Enterprise Real Time 15 SP2 bouncycastle Affected
SUSE Linux Enterprise Real Time 15 SP3 bouncycastle Affected
SUSE Linux Enterprise Real Time 15 SP4 bouncycastle Affected
SUSE Linux Enterprise Server 15 SP2 bouncycastle Affected
SUSE Linux Enterprise Server 15 SP2-BCL bouncycastle Affected
SUSE Linux Enterprise Server 15 SP2-LTSS bouncycastle Affected
SUSE Linux Enterprise Server 15 SP3 bouncycastle Affected
SUSE Linux Enterprise Server 15 SP3-BCL bouncycastle Affected
SUSE Linux Enterprise Server 15 SP3-LTSS bouncycastle Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 bouncycastle Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 bouncycastle Affected
SUSE Manager Proxy 4.1 bouncycastle Affected
SUSE Manager Proxy 4.2 bouncycastle Affected
SUSE Manager Proxy 4.3 bouncycastle Affected
SUSE Manager Retail Branch Server 4.1 bouncycastle Affected
SUSE Manager Retail Branch Server 4.2 bouncycastle Affected
SUSE Manager Retail Branch Server 4.3 bouncycastle Affected
SUSE Manager Server 4.1 bouncycastle Affected
SUSE Manager Server 4.2 bouncycastle Affected
SUSE Manager Server 4.3 bouncycastle Affected
openSUSE Leap 15.3 bouncycastle Affected
openSUSE Leap 15.4 bouncycastle Affected
openSUSE Leap 15.5 bouncycastle Affected
openSUSE Leap 15.6 bouncycastle Affected
Products at an unknown state of their lifecycle.
SUSE Linux Enterprise Server for NVIDIA 16.1 bouncycastle Affected
Container Status
containers/apache-pulsar:3.3 bouncycastleAffected

SUSE Timeline for this CVE

CVE page created: Mon Oct 5 16:44:23 2026
CVE page last modified: Fri Oct 9 11:49:33 2026