Upstream information
Description
In Bouncy Castle for Java before 1.86, BLS12_381BasicScheme.keyValidate, and so BLSPublicKeyParameters and every BasicScheme, MessageAugmentation and ProofOfPossession verify and aggregateVerify that gate on it, accepted a public key built on a foreign ECCurve that merely shares BLS12-381's field characteristic. The prime-order subgroup check trusts a point's own curve to name its cofactor, since ECPoint.satisfiesOrder returns true outright when the curve's cofactor is one, so a point on a curve with a different equation and a cofactor forged to one passed keyValidate despite not being a G1 point at all. In BC's pairing implementation such a point contributes the identity in the target group, so an aggregate signature verified against a set of public keys including it is accepted even though it contains no signature for that key and message pair, admitting a phantom signer. keyValidate now first confirms that the point's curve carries exactly the canonical G1 field, equation, order and cofactor before any subgroup check. The issue is reachable only where an application constructs an ECPoint on an explicit, non-canonical curve and accepts it as an authority-bearing key; the standard 48-byte compressed-point decoder always supplies the canonical curve and was never affected.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | SUSE |
|---|---|
| Base Score | 5.9 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality Impact | None |
| Integrity Impact | High |
| Availability Impact | None |
| CVSSv3 Version | 3.1 |
| CVSS detail | CNA (91579145-5d7b-4cc5-b925-a0262ff19630) | SUSE |
|---|---|---|
| Base Score | 7.1 | 8.2 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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:N/VI:H/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 | Passive | None |
| Vulnerable System Confidentiality Impact | None | None |
| 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 16:44:23 2026CVE page last modified: Wed Oct 7 20:03:33 2026