High severity · published Aug 3, 2026
CVE-2026-59642
CMS AuthenticatedData content not bound to MAC when authAttrs present
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
In Bouncy Castle for Java before 1.85, CMS AuthenticatedData content not bound to MAC when authAttrs present. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% 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.
1.0.0 before 1.0.12; 2.0.0 before 2.0.12; 2.1.0 before 2.1.12 · source: vendor
BC
BC-JAVA · Legion of the Bouncy Castle Inc.
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
Bcpkix-fips · Bouncycastle
before 1.0.12; 2.0.7 before 2.0.12; 2.1.8 before 2.1.12 · source: NVD
BC
Bouncy Castle For Java Lts · Bouncycastle
through 2.73.11 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59642
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59642
Patch
https://github.com/bcgit/bc-java/commit/2117f316a5a47308f3e569695a6592b16aac0dd7
Third Party Advisory
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059642
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