CVE-2026-11310: X.509 trust-chain bypass in wolfSSL_X509_verify_cert() via untrusted intermediate anchoring

highCVSS 7.5CVE-2026-11310

CSIRTS triage

vendor: wolfSSLOther

What: A trust-chain bypass can occur via untrusted intermediate anchoring in wolfSSL.
Who is affected: Applications using wolfSSL for secure communications.
Urgency: High urgency due to a CVSS score of 7.5, indicating significant risk.
Action: Update to the latest version of wolfSSL to mitigate this issue.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-11310

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-113100.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-11310	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highCVE-2026-11310: X.509 trust-chain bypass in the OpenSSL compatibility certificate verifier (wolfSSL_X509_verif…nvd

Recent advisories for X.509 trust-chain bypass

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-11310: X.509 trust-chain bypass in the OpenSSL compatibility certificate verifier (wolfSSL_X509_verif…nvd · 2026-06-25
highCVE-2026-11999: X.509 trust-chain bypass via path-depth exhaustion in wolfSSL_X509_verify_cert()msrc · 2026-06-09