CVE-2026-11310
X.509 trust-chain bypass in wolfSSL verify certs with untrusted intermediates.
Is CVE-2026-11310 being exploited?
Not confirmed. CVE-2026-11310 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 0.23% probability of exploitation in the next 30 days.
How severe is CVE-2026-11310?
CVE-2026-11310 is rated High with a CVSS score of 8.7. 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-2026-11310?
Yes. A fix has been recorded for CVE-2026-11310. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-11310 affect?
CVE-2026-11310 affects wolfSSL library (OPENSSL_EXTRA builds) using X509_verify_cert() with caller-supplied untrusted intermediates. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-11310?
Upgrade to patched wolfSSL; review cert verification usage.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker-chosen untrusted intermediates can anchor a cert path and be accepted, bypassing trust checks in non-TLS cert verifications.
Patch when possible
- affected>= 5.8.4 and <= 5.9.1
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.