Bouncy Castle is a widely used Java crypto library; this bug allows TLS validation bypass across many applications and services, posing broad enterprise risk.
CVE-2026-58062
Bouncy Castle accepts stapled OCSP responses not bound to the certificate.
Is CVE-2026-58062 being exploited?
Not confirmed. CVE-2026-58062 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.34% probability of exploitation in the next 30 days.
How severe is CVE-2026-58062?
CVE-2026-58062 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-58062?
Yes. A fix has been recorded for CVE-2026-58062. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-58062 affect?
CVE-2026-58062 affects Bouncy Castle for Java < 1.85, Bouncy Castle for Java LTS < 2.73.12, Bouncy Castle FIPS (bc-fips) < 2.0.2 (2.0.x) and < 2.1.3 (2.1.x). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-58062?
Upgrade to Java 1.85+, LTS 2.73.12+, or bc-fips 2.0.2/2.1.3 and redeploy.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Forged stapled OCSP responses can validate malicious or revoked certs, enabling TLS MITM and server/client impersonation.
Immediate action required
- affected>= 2.0.0 and < 2.0.2
- affected>= 2.1.0 and < 2.1.3
- affected>= 1.66 and < 1.85
- affected>= 2.73.0 and < 2.73.12
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.