Critical

Improper stapled OCSP certificate binding in Bouncy Castle Java

IdentifiersCVE-2026-58062CWE-295· Improper Certificate Validation

CVE-2026-58062 is an improper certificate-validation vulnerability in Bouncy Castle Java implementations. The stapled OCSP validation path accepts a response without binding it to the certificate being checked, potentially allowing a response for another certificate to satisfy revocation-status validation. Affected versions are Bouncy Castle for Java before 1.85, Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before 2.0.2 in the 2.0.x series and before 2.1.3 in the 2.1.x series.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

An attacker may supply an OCSP response for a different certificate and potentially bypass the intended revocation-status validation of the certificate being checked. This undermines certificate validation in applications relying on the affected stapled OCSP processing path.

Mitigation

If you can’t patch tonight, do this now.

Until upgrades are completed, avoid relying on the vulnerable stapled OCSP validation paths where possible and use independent certificate revocation-validation controls.

Remediation

Patch, then assume compromise.

Upgrade Bouncy Castle for Java to 1.85 or later, Bouncy Castle for Java LTS to 2.73.12 or later, BC-FJA 2.0.x to 2.0.2 or later, or BC-FJA 2.1.x to 2.1.3 or later, as appropriate for the deployed release branch.

PUBLIC EXPLOITS

Exploits

No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.

VALID 0 / 1 TOTALView more in app

All candidate exploits were filtered out by Mallory's validation.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Bouncy CastleBc-Fipsapplication

Bouncy CastleBc-Javaapplication

Bouncy CastleBouncy Castle For Javaapplication

Bouncy CastleBouncy Castle For Java Ltsapplication

Bouncy CastleFips Java Apiapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

10 SOURCESView more in app

ghsa syntheticNews

Aug 3, 2026

GHSA-j295-77c3-9frf

A certificate-validation flaw in Bouncy Castle for Java in which a stapled OCSP response can be accepted without being cryptographically bound to the certificate being checked, potentially allowing an invalid or inappropriate revocation-status response to be accepted.

cvefeed high severityNews

Aug 3, 2026

CVE-2026-58062 - Stapled OCSP response accepted without binding to the checked certificate

An improper certificate validation vulnerability in Bouncy Castle Java libraries where a stapled OCSP response is accepted without being bound to the checked certificate.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity8