CVE-2026-59641

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 v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/bcgit/bc-java/commit/2f81b22d559b3a1b026388e1ca78dd547384def8	Patch
https://github.com/bcgit/bc-java/commit/fd89fe918b37fea1c71e95fae50284a325b09721	Patch
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059641	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:bouncycastle:bc-java::::::::
	cpe:2.3:a:bouncycastle:bcjmail-fips::::::::
	cpe:2.3:a:bouncycastle:bcjmail-fips::::::::
	cpe:2.3:a:bouncycastle:bcjmail-fips::::::::
	cpe:2.3:a:bouncycastle:bcmail-fips::::::::
	cpe:2.3:a:bouncycastle:bcmail-fips::::::::
	cpe:2.3:a:bouncycastle:bcmail-fips::::::::
	cpe:2.3:a:bouncycastle:bouncy_castle_for_java_lts::::::::

History

No history.

Information

Published : 2026-08-03 01:16

Updated : 2026-08-28 18:09

NVD link : CVE-2026-59641

Mitre link : CVE-2026-59641

CVE.ORG link : CVE-2026-59641

JSON object : View

Products Affected

bouncycastle

bouncy_castle_for_java_lts
bcjmail-fips
bc-java
bcmail-fips

CWE

CWE-345

Insufficient Verification of Data Authenticity

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"baseScore": 8.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "AMBER", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "91579145-5d7b-4cc5-b925-a0262ff19630", "affectedData": [{"repo": "https://github.com/bcgit/bc-java", "vendor": "Legion of the Bouncy Castle Inc.", "modules": ["mail"], "product": "BC-JAVA", "versions": [{"status": "affected", "version": "0", "lessThan": "1.85", "versionType": "maven"}], "platforms": ["all"], "packageURL": "pkg:maven/org.bouncycastle/bcmail-jdk18on", "packageName": "bcmail", "programFiles": ["SignedMailValidator"], "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java/", "defaultStatus": "unaffected"}, {"repo": "https://github.com/bcgit/bc-lts-java", "vendor": "Legion of the Bouncy Castle Inc.", "modules": ["mail"], "product": "BC-LTS-JAVA", "versions": [{"status": "affected", "version": "2.73.0", "lessThan": "2.73.12", "versionType": "maven"}], "platforms": ["all"], "packageURL": "pkg:maven/org.bouncycastle/bcmail-lts8on", "packageName": "bcmail-lts8on", "programFiles": ["SignedMailValidator"], "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java-lts/", "defaultStatus": "unaffected"}, {"vendor": "Legion of the Bouncy Castle Inc.", "product": "BC-FJA", "versions": [{"status": "affected", "version": "1.0.0", "lessThan": "1.0.7", "versionType": "maven"}, {"status": "affected", "version": "2.0.0", "lessThan": "2.0.7", "versionType": "maven"}, {"status": "affected", "version": "2.1.0", "lessThan": "2.1.7", "versionType": "maven"}], "platforms": ["all"], "packageURL": "pkg:maven/org.bouncycastle/bcmail-fips", "packageName": "bcmail-fips", "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java-fips/", "defaultStatus": "unaffected"}, {"vendor": "Legion of the Bouncy Castle Inc.", "product": "BC-FJA", "versions": [{"status": "affected", "version": "1.0.4", "lessThan": "1.0.7", "versionType": "maven"}, {"status": "affected", "version": "2.0.0", "lessThan": "2.0.7", "versionType": "maven"}, {"status": "affected", "version": "2.1.0", "lessThan": "2.1.7", "versionType": "maven"}], "platforms": ["all"], "packageURL": "pkg:maven/org.bouncycastle/bcjmail-fips", "packageName": "bcjmail-fips", "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java-fips/", "defaultStatus": "unaffected"}]}], "published": "2026-08-03T01:16:44.060", "references": [{"url": "https://github.com/bcgit/bc-java/commit/2f81b22d559b3a1b026388e1ca78dd547384def8", "tags": ["Patch"], "source": "91579145-5d7b-4cc5-b925-a0262ff19630"}, {"url": "https://github.com/bcgit/bc-java/commit/fd89fe918b37fea1c71e95fae50284a325b09721", "tags": ["Patch"], "source": "91579145-5d7b-4cc5-b925-a0262ff19630"}, {"url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059641", "tags": ["Third Party Advisory"], "source": "91579145-5d7b-4cc5-b925-a0262ff19630"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "91579145-5d7b-4cc5-b925-a0262ff19630", "description": [{"lang": "en", "value": "CWE-345"}]}], "descriptions": [{"lang": "en", "value": "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)."}], "lastModified": "2026-08-28T18:09:14.440", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FA6A5663-2E62-44AA-8A64-A3CB0DC8813B", "versionEndExcluding": "1.85"}, {"criteria": "cpe:2.3:a:bouncycastle:bcjmail-fips:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8A54A2DB-3346-43B7-A019-C8ACA36E9139", "versionEndExcluding": "1.0.7"}, {"criteria": "cpe:2.3:a:bouncycastle:bcjmail-fips:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A6F72DA1-77BC-4154-8447-D5CB55F1C5B1", "versionEndExcluding": "2.0.7", "versionStartIncluding": "2.0.5"}, {"criteria": "cpe:2.3:a:bouncycastle:bcjmail-fips:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AAC24E05-AF82-47F6-87B1-81B6717E86F1", "versionEndExcluding": "2.1.7", "versionStartIncluding": "2.1.6"}, {"criteria": "cpe:2.3:a:bouncycastle:bcmail-fips:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0457821F-6E6C-4887-81F1-CD5A31BD233B", "versionEndExcluding": "1.0.7"}, {"criteria": "cpe:2.3:a:bouncycastle:bcmail-fips:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BC4154F2-2ECD-4D3A-9726-8873E778BE60", "versionEndExcluding": "2.0.7", "versionStartIncluding": "2.0.5"}, {"criteria": "cpe:2.3:a:bouncycastle:bcmail-fips:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5052B8CA-A66B-4D70-B4FD-079D5041C2AC", "versionEndExcluding": "2.1.7", "versionStartIncluding": "2.1.6"}, {"criteria": "cpe:2.3:a:bouncycastle:bouncy_castle_for_java_lts:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F5ED4F42-08FF-4642-815D-1ED0C82FDBD2", "versionEndIncluding": "2.73.11"}], "operator": "OR"}]}], "sourceIdentifier": "91579145-5d7b-4cc5-b925-a0262ff19630"}