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CWE-326Weakness · CWE-326

CVE-2026-59651

HIGH · 7.1 CVSS v4.0 Published 2026-08-03
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
78/100
Remediation priority · High
Remotely reachable No privileges Patch available 3 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In Bouncy Castle for Java before 1.85, BKS keystore accepts legacy version with 16-bit integrity MAC key. This issue also affects Bouncy Castle for Java LTS before 2.73.12.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
Authentication
X
User interaction
P
Scope
X

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix Moderate confidence

Bouncy Castle Java 1.85 (main line) or 2.73.12 (LTS line)

  1. 1. Identify the current Bouncy Castle for Java version in use by checking project dependencies (e.g., pom.xml for Maven, build.gradle for Gradle)
  2. 2. If using the main release line, upgrade to version 1.85 or later
  3. 3. If using the LTS release line (2.x), upgrade to version 2.73.12 or later
  4. 4. Rebuild and test the application to verify the upgrade does not break existing functionality
  5. 5. Verify the BKS keystore now rejects legacy version with 16-bit MAC key by attempting to load such a keystore
Caveat Minor: Ensure any legacy BKS keystores with 16-bit MAC keys are re-generated using stronger key derivation; existing keystores using proper MAC sizes should work unchanged

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-59651 in production — separate from our analysis above.

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  • Version or environment caveats, and links to real fixes
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