Upstream information
Description
In Bouncy Castle for Java before 1.86, the high-level OpenPGP certificate API accepted a third-party certification or trust delegation from any component key of the issuing certificate, without requiring that component to have been granted the authority to certify. OpenPGPCertificate.getCertificationBy() and getDelegationBy() resolve a third-party signature by matching its issuer key identifier against every key of the third-party certificate, then verify the issuing component's binding chain and the signature itself; nothing checked that the issuing component carried the RFC 9580 sec. 5.2.3.29 certification key flag (CERTIFY_OTHER) when the signature was created. A subkey bound only with SIGN_DATA - the online signing subkey of exactly the offline-primary arrangement those key flags exist to express - could therefore issue a positive User ID certification over an attacker-controlled identity, or a full-trust depth-one direct-key delegation of introducer trust, and the API returned it as a valid signature chain attributed to the third-party certificate. An application treating getCertificationBy(...).isValid() or getDelegationBy(...) as an identity or trusted-introducer decision would attribute the attacker's assertion to the offline primary key. The same held for a legacy RSA subkey bound only for encryption, whose algorithm is nonetheless able to sign. This does not forge the primary key's signature or recover any private key; it promotes an already-compromised restricted subkey to the primary key's identity-issuing authority, defeating the containment the key-flag separation provides. A third-party certification or delegation is now attributed to the issuing certificate only when the component key that made it is the primary key, or is a subkey holding CERTIFY_OTHER when the signature was created, so certification-capable subkeys continue to be accepted; primary keys are accepted whatever their key flags say, since a primary key is certification-capable by construction and certificates carrying no key flags subpacket at all are common. Third-party revocations are deliberately outside the rule, since declining to honour one would keep trust alive rather than withdraw it.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | SUSE |
|---|---|
| Base Score | 6.5 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality Impact | Low |
| Integrity Impact | High |
| Availability Impact | None |
| CVSSv3 Version | 3.1 |
| CVSS detail | CNA (91579145-5d7b-4cc5-b925-a0262ff19630) | SUSE |
|---|---|---|
| Base Score | 8.2 | 8.3 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/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 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N |
| Attack Vector | Network | Network |
| Attack Complexity | Low | Low |
| Attack Requirements | Present | Present |
| Privileges Required | None | None |
| User Interaction | None | None |
| Vulnerable System Confidentiality Impact | None | Low |
| Vulnerable System Integrity Impact | High | High |
| 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 |
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 | Affected |
| SUSE Linux Enterprise Module for Development Tools 15 SP7 | bouncycastle | Affected |
| SUSE Linux Enterprise Server 15 SP7 | bouncycastle | Affected |
| 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 | Affected |
| 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 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | bouncycastle | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | bouncycastle | Affected |
| 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 | Affected |
| SUSE Linux Enterprise Server 15 SP5 | bouncycastle | Affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | bouncycastle | Affected |
| SUSE Linux Enterprise Server 15 SP6 | bouncycastle | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | bouncycastle | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | bouncycastle | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | bouncycastle | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | bouncycastle | Affected |
| 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 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | bouncycastle | Affected |
| 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 | bouncycastle | Affected |
SUSE Timeline for this CVE
CVE page created: Mon Oct 5 15:42:41 2026CVE page last modified: Wed Oct 7 20:03:32 2026