# CVE-2026-71891: bouncycastle: In Bouncy Castle for Java before 1.86, BLS12_381BasicScheme.keyValidate, and so BLSPublicKeyParameters and every Basi...

CVE-2026-71891 is fixed in bouncycastle on 1 platform, first by DEBIAN-CVE-2026-71891, released October 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-71891
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 3, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bouncycastle Debian 14 | 1.86-1 | [DEBIAN-CVE-2026-71891](https://patchblox.com/security/data/fix/linux/debian-cve-2026-71891.md) | Oct 3, 2026 |
| Linux | bouncycastle opensuse-leap 16.0 | 1.86-160000.1.1 | [OPENSUSE-SU-2026:22169-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22169-1.md) | Nov 7, 2026 |
| Linux | bouncycastle sles 15.6 | 1.86-150200.3.41.1 | [SUSE-SU-2026:4797-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4797-1.md) | Nov 7, 2026 |
| Linux | bouncycastle sles 15.7 | 1.86-150200.3.41.1 | [SUSE-SU-2026:4797-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4797-1.md) | Nov 7, 2026 |
| Linux | bouncycastle sles 16.0 | 1.86-160000.1.1 | [SUSE-SU-2026:24461-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24461-1.md) | Nov 7, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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