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CWE-203Weakness · CWE-203

CVE-2026-59640

HIGH · 8.7 CVSS v4.0 Published 2026-08-03
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
96/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click 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, OpenPGP CFB quick-check oracle active on symmetric/session-key paths. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).

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
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/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 (or 2.73.12 LTS), bcpg-fips 1.0.13/2.0.13/2.1.13 for FIPS versions

  1. 1. Identify the current Bouncy Castle for Java library version in your project by checking your build configuration (Maven pom.xml, Gradle build.gradle, or direct JAR dependency)
  2. 2. For non-FIPS Bouncy Castle: upgrade to version 1.85 or later (or 2.73.12 or later for LTS)
  3. 3. For FIPS (BC-FJA) version: upgrade to bcpg-fips 1.0.13+, 2.0.13+, or 2.1.13+ depending on your FIPS series
  4. 4. Update the dependency version in your build configuration file
  5. 5. Rebuild your project and run tests to verify the upgrade does not break existing functionality
  6. 6. Deploy the updated application
Caveat Review release notes for any API changes between your current version and the target upgrade version; FIPS users should ensure the chosen FIPS series aligns with their certification requirements

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-2026-59640 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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