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Bouncy Castle CVE-2026-58062

| EUVDEUVD-2026-52089 CRITICAL
Improper Certificate Validation (CWE-295)
2026-08-03 bcorg GHSA-j295-77c3-9frf
Java Information Disclosure Bc Java Bc Lts Java Bc Fja Suse Red Hat
9.3
CVSS 4.0 · Vendor: bcorg
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Severity by source

Vendor (bcorg) PRIMARY
9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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
7.4 HIGH

Network-facing revocation bypass but needs a revoked cert plus a mismatched signed OCSP response and OCSP reliance, so AC:H; enables MITM/impersonation giving C:H/I:H, no availability impact.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Red Hat
7.4 HIGH
qualitative

Primary rating from Vendor (bcorg).

CVSS VectorVendor: bcorg

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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 - 03:01 vuln.today
Analysis Generated
Aug 03, 2026 - 03:01 vuln.today
CVE Published
Aug 03, 2026 - 02:35 cve.org
CRITICAL 9.3

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, Stapled OCSP response accepted without binding to the checked certificate. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

AnalysisAI

Certificate revocation-check bypass in the Bouncy Castle for Java (bc-java) PKIX provider allows a validly-signed OCSP response issued for one certificate to be accepted as proof-of-status for a different certificate, because the stapled response is not bound to the CertID of the certificate actually being checked. This means a revoked end-entity certificate can pass PKIXRevocationChecker validation when a 'good' OCSP response for another serial (e.g. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain revoked cert and mismatched signed OCSP 'good' response
Delivery
Present cert to victim's TLS/PKI client
Exploit
Staple OCSP response bound to other CertID
Execution
PKIXRevocationChecker accepts non-matching response
Persist
Revocation check bypassed, connection trusted
Impact
Establish MITM / impersonation
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the relying application performs OCSP revocation checking through Bouncy Castle's PKIXRevocationChecker and consumes a stapled/supplied OCSP response (via setOcspResponses) or an AIA-fetched response (itself gated behind the ocsp.enable security property, disabled by default in BC). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are mixed and warrant careful interpretation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker holding a certificate that has been revoked (for example after a stolen private key) positions themselves as a TLS peer or MITM and staples a validly-signed OCSP 'good' response that actually covers a different certificate's serial (such as the CA's). A relying Java application using vulnerable Bouncy Castle OCSP revocation checking accepts the mismatched response as proof the presented certificate is not revoked, and the connection is trusted despite the revocation. …
Remediation Upgrade to a fixed release: bc-java 1.85 or later, bc-lts-java 2.73.12 or later, and for FIPS deployments BC-FJA 2.0.2 (2.0.X series) or 2.1.3 (2.1.X series) or later; the corresponding upstream fix is commit add5f822660f3b2c29fd824e2f4095469c42a1c7 (https://github.com/bcgit/bc-java/commit/add5f822660f3b2c29fd824e2f4095469c42a1c7) and the advisory at https://github.com/bcgit/bc-java/wiki/CVE-2026-58062. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Java applications using Bouncy Castle (bc-java, bc-lts-java, and BC-FJA/FIPS variants) and identify which systems perform certificate revocation validation via OCSP. …

Sign in for detailed remediation steps and compensating controls.

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

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Vendor StatusVendor

SUSE

Severity: Critical
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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CVE-2026-58062 vulnerability details – vuln.today
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