CVE-2026-11999: X.509 trust-chain bypass via path-depth exhaustion in wolfSSL_X509_verify_cert()

highCVSS 7.5CVE-2026-11999

CSIRTS triage

vendor: wolfSSL product: wolfSSLOther

What: A trust-chain bypass vulnerability exists via path-depth exhaustion in wolfSSL_X509_verify_cert().
Who is affected: Users of wolfSSL are affected.
Urgency: Remediation is high urgency due to the potential for exploitation.
Action: Update to the latest version of wolfSSL.

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

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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-2026-11999

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-2026-119990.14% 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-2026-11999	coverage & exploitation status	NVD · CVE.org

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-2026-11310: X.509 trust-chain bypass in wolfSSL_X509_verify_cert() via untrusted intermediate anchoringmsrc · 2026-06-09