CVE-2026-45447: Heap Use-After-Free in the PKCS7_verify() Function

highCVSS 8.8CVE-2026-45447

CSIRTS triage

Other

What: This vulnerability is a heap use-after-free in the PKCS7_verify() function.
Who is affected: Deployments using the affected PKCS7 library.
Urgency: Remediation is urgent due to the high severity rating, although exploitation is not currently reported.
Action: Update to the latest version of the library that addresses 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 8.8
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45447

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.

Moderate exploitation riskCVE-2026-454472.7% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 84% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-45447	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[UPDATE] [high] OpenSSL: Multiple Vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Tenable Identity Exposure (June 24, 2026)cert-fr-avis

Recent advisories for Heap Use-After-Free in

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