Vulnerability details

CVE-2026-59641

Legion of the Bouncy Castle BC-FJALegion of the Bouncy Castle BC-JAVALegion of the Bouncy Castle BC-LTS-JAVA

S/MIME validator trusts signer-asserted signingTime for path validation

CVSS 4.0

8.7High

Official description

In Bouncy Castle for Java before 1.85, S/MIME validator trusts signer-asserted signingTime for path validation. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcmail-fips and bcjmail-fips 1.0.7 (1.0.X series), 2.0.7 (2.0.X series) and 2.1.7 (2.1.X series).

CVSS scores

Score	Version	Source	Vector
8.7High	4.0	CVEProject cvelistV5 (CNA) (bcorg)	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber`

Affected products

Vendor	Product	Versions	Source
Legion of the Bouncy Castle Inc.	BC-FJA	1.0.0 ≤ v < 1.0.7	CVEProject cvelistV5 (CNA)
Legion of the Bouncy Castle Inc.	BC-FJA	1.0.4 ≤ v < 1.0.7	CVEProject cvelistV5 (CNA)
Legion of the Bouncy Castle Inc.	BC-FJA	2.0.0 ≤ v < 2.0.7	CVEProject cvelistV5 (CNA)
Legion of the Bouncy Castle Inc.	BC-FJA	2.0.0 ≤ v < 2.0.7	CVEProject cvelistV5 (CNA)
Legion of the Bouncy Castle Inc.	BC-FJA	2.1.0 ≤ v < 2.1.7	CVEProject cvelistV5 (CNA)
Legion of the Bouncy Castle Inc.	BC-FJA	2.1.0 ≤ v < 2.1.7	CVEProject cvelistV5 (CNA)
Legion of the Bouncy Castle Inc.	BC-JAVA	v < 1.85	CVEProject cvelistV5 (CNA)
Legion of the Bouncy Castle Inc.	BC-LTS-JAVA	2.73.0 ≤ v < 2.73.12	CVEProject cvelistV5 (CNA)

References and advisories

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Details

Published: 2026-08-03
Last updated: 2026-08-03
State: Published
Assigner (CNA): bcorg

Exploit prediction (EPSS)

0.17%

Probability of exploitation in 30 days

7.4%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-345
Insufficient Verification of Data Authenticity