Advisory details:
gitlab / maven/org.bouncycastle/bcprov-jdk14/CVE-2026-59650
| Advisory ID | gitlab/maven/org.bouncycastle/bcprov-jdk14/CVE-2026-59650 |
| Aliases |
CVE-2026-59650
|
| Summary | MTI/A0 DH agreement exponentiates unvalidated peer value Affects Bouncy Castle for Java before 1.85. DHAgreement, implementing the MTI/A0 two-pass variant, raises the peer-supplied message value to the local static private key without any range or subgroup-membership check, unlike the validated public-key argument. A malicious peer that repeatedly sends small-order elements learns the private key modulo a small prime from each exchange and recovers it in full by combining them. DHBasicAgreement is unaffected because its only input is validated. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 0.0 |
| Risk | |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.bouncycastle/bcprov-jdk14/CVE-2026-59650.yml |
| Reference id | Reference type | URL |
|---|---|---|
| CVE-2026-59650 | https://github.com/bcgit/bc-java/wiki/CVE-2026-59650 | |
| CVE-2026-59650 | https://nvd.nist.gov/vuln/detail/CVE-2026-59650 | |
| daeaae9d7075d04f40812e68671ebf4c777b5148 | Other | https://github.com/bcgit/bc-java/commit/daeaae9d7075d04f40812e68671ebf4c777b5148 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
There are no SSVC decisions available.