CVE-2026-35188: Double-free When Checking OCSP Stapled Response

CSIRTS triage

What

A double-free vulnerability occurs when checking OCSP stapled responses.

Who is affected

Systems processing OCSP stapled responses in affected software.

Urgency

Remediation is moderately urgent as memory corruption can lead to denial of service or code execution.

Action

Update to a patched version that fixes the double-free in OCSP staple handling.

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

Details

Source

Microsoft Security Response Center (INTL · vendor-psirt · site)

Severity

medium — CVSS 5

Published

2026-08-06

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35188

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-2026-351880.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• high[UPDATE] [high] OpenSSL: Multiple Vulnerabilitiescert-bund
• high[NEW] [high] Oracle Solaris third-party components: Multiple vulnerabilitiescert-bund
• unknownMultiple vulnerabilities in Tenable Identity Exposure (June 24, 2026)cert-fr-avis

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