CVE-2026-58062Network attack vector

Certificate validation bypass via unbound stapled OCSP response

Published Aug 3, 2026 · Updated Aug 3, 2026

Improper certificate validation in affected Bouncy Castle Java editions allows remote attackers to bypass revocation checks via stapled OCSP. ProvOcspRevocationChecker verifies the response signature but returns successfully when no SingleResponse CertID matches the checked certificate, instead of rejecting the response or falling back to a CRL. A TLS server with a revoked certificate can therefore staple a valid response for another certificate; affected releases are Java 1.66 through 1.84, Java LTS 2.73.0 through 2.73.11, and FIPS Java API 2.0.0 through 2.0.1 and 2.1.0 through 2.1.2.

CVSS severity9.3

Critical

EPSS probability0.34%

Next 30 days · Sep 16, 2026

Known exploitationUnconfirmed

Based on sourced intelligence

Hinoki checkNot available

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Summary

What happened

The record

CVE: CVE-2026-58062
Published: Aug 3, 2026
Updated: Aug 3, 2026

Vendor: Legion of the Bouncy Castle Inc.
Product: Bouncy Castle Java
Classifications: CWE-295, T1557

Attack vector: network
Privileges: unauthenticated

Timeline

How it unfolded

Aug 3, 2026CVE publishedPublication date reported by the CVE source.
Aug 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

Affected versionversion=1.66 <1.85

What conditions does exploitation require?

Attack vectornetwork

Required privilegesunauthenticated

What is affected?

Legion of the Bouncy Castle Inc. · Bouncy Castle Javaversion=1.66 <1.85

Legion of the Bouncy Castle Inc. · Bouncy Castle FIPS Java APIversion=2.0.0 <2.0.2; version=2.1.0 <2.1.3

Legion of the Bouncy Castle Inc. · Bouncy Castle Java LTSversion=2.73.0 <2.73.12

Published CVSS scores

9.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

9.3Legion of the Bouncy Castle Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026

Latest reporting daySep 16, 2026

Latest daily unique IPsUnavailable

Prior 30-day averageUnavailable

SourceShadowserver honeypots (KEV)

Vectornetwork

Privilegesunauthenticated

Known exploitationUnconfirmed

Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation

T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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