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Bouncy Castle Java EUVDEUVD-2026-52033

| CVE-2026-59641 HIGH
Insufficient Verification of Data Authenticity (CWE-345)
2026-08-03 bcorg GHSA-vgvx-fcjw-w4m8
Java Information Disclosure Bc Java Bc Lts Java Bc Fja
8.7
CVSS 4.0 · Vendor: bcorg
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Severity by source

Vendor (bcorg) PRIMARY
8.7 HIGH
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
vuln.today AI
7.5 HIGH

Network-delivered S/MIME message requires no privileges on the target system; integrity impact is high as revoked-certificate signatures are accepted; no confidentiality or availability impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative

Primary rating from Vendor (bcorg).

CVSS VectorVendor: 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/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 03, 2026 - 01:36 vuln.today
Analysis Generated
Aug 03, 2026 - 01:36 vuln.today
CVE Published
Aug 03, 2026 - 00:54 cve.org
HIGH 8.7

DescriptionCVE.org

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).

AnalysisAI

Signature forgery via back-dated signingTime in Bouncy Castle's S/MIME validator allows an attacker holding a revoked or expired signing certificate to have that certificate accepted as valid by unpatched validators. The SignedMailValidator in bc-java before 1.85, bc-lts-java before 2.73.12, and all bc-fja (FIPS) lines before their respective 1.0.7/2.0.7/2.1.7 fixes unconditionally used the signer-asserted CMS signingTime attribute as the PKIX path-validation date, making certificate expiry and revocation checks bypassable. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Retain private key from revoked/expired signing certificate
Delivery
Craft S/MIME message with back-dated signingTime attribute
Exploit
Deliver signed message to target S/MIME processing service
Execution
SignedMailValidator pins PKIX validation date to attacker-controlled signingTime
Persist
Certificate passes revocation and expiry checks at back-dated instant
Impact
Forged signature accepted as valid
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Vulnerability AssessmentAI

Exploitation Exploitation requires three concrete conditions: (1) The target application must invoke Bouncy Castle's SignedMailValidator to process S/MIME signed messages - applications that do not use this specific class are unaffected. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H) reflects high integrity impact with no special preconditions on the target system, which is accurate for automated mail-processing pipelines that call SignedMailValidator without pinning a trusted date. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker whose signing certificate was revoked or has expired obtains or retains the private key material. They craft an S/MIME signed message embedding a CMS signingTime attribute set to a date within the certificate's original validity window - before revocation or expiry - and send it to a target application (e.g., an enterprise email gateway or document verification service) running an unpatched Bouncy Castle SignedMailValidator without a caller-supplied PKIXParameters date. …
Remediation Upgrade to Bouncy Castle for Java 1.85 or later, Bouncy Castle LTS 2.73.12 or later, or the appropriate FIPS line fix release (bcmail-fips/bcjmail-fips 1.0.7, 2.0.7, or 2.1.7 depending on the series in use). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Immediately audit all systems to identify applications using Bouncy Castle (bc-java, bc-lts-java, bc-fja) and document deployed versions. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected

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EUVD-2026-52033 vulnerability details – vuln.today
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