CVE-2026-59640CWE-203

CVE-2026-59640

Medium · published August 3, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
27.0
In the wild
Unconfirmed
What it is

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).

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00347 · 27.0th percentile
Weakness
CWE-203 · Observable Discrepancy
Published
2026-08-03T05:16Z
Affected products (5)
ProductVersionsFixed in
bouncycastle/bc-java< 1.851.85
bouncycastle/bcpg-fips< 1.0.131.0.13
bouncycastle/bcpg-fips≥ 2.0.8, < 2.0.132.0.13
bouncycastle/bcpg-fips≥ 2.1.10, < 2.1.132.1.13
bouncycastle/bouncy_castle_for_java_lts≤ 2.73.11—
References (2)
https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e · 91579145-5d7b-4cc5-b925-a0262ff19630https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059640 · 91579145-5d7b-4cc5-b925-a0262ff19630
EPSS history
Timeline
  • 03 AUG 00:55Z
    OpenPGP CFB quick-check oracle active on symmetric/session-key paths
    cvelistv5