CVE-2026-59648: OpenPGP Argon2 S2K honours attacker-chosen memory and passes

Description

In Bouncy Castle for Java before 1.85, OpenPGP Argon2 S2K honours attacker-chosen memory and passes. 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).

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

Low

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.4% · higher than 36% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

BC

BC-FJA · Legion of the Bouncy Castle Inc.

1.0.6 before 1.0.13; 2.0.0 before 2.0.13; 2.1.0 before 2.1.13 · source: vendor

BC

BC-JAVA · Legion of the Bouncy Castle Inc.

1.71 before 1.85 · source: vendor, NVD

BC

BC-LTS-JAVA · Legion of the Bouncy Castle Inc.

2.73.0 before 2.73.12 · source: vendor

BC

Bcpg-fips · Bouncycastle

1.0.6 before 1.0.13; 2.0.8 before 2.0.13; 2.1.10 before 2.1.13 · source: NVD

BC

Bouncy Castle For Java Lts · Bouncycastle

through 2.73.11 · source: NVD