---
id: CVE-2026-59640
title: >-
  In Bouncy Castle for Java before 1.85, OpenPGP CFB quick-check oracle active
  on symmetric/session-key paths
summary: >-
  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…
severity: none
cwe:
  - CWE-203
published: '2026-08-03'
updated: '2026-08-03'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59640'
references:
  - url: >-
      https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e
    label: 91579145-5d7b-4cc5-b925-a0262ff19630
  - url: 'https://github.com/bcgit/bc-java/wiki/CVE-2026-59640'
    label: 91579145-5d7b-4cc5-b925-a0262ff19630
tags:
  - nvd
ingestedAt: '2026-08-03T01:21:07.756Z'
epss: 0.00217
epssPercentile: 0.12377
---

## Overview

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).

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.