Published Apr 10, 2026Sources checked Nov 12, 2026
5.4MEDIUMCVSS out of 10
What this means
Review the available evidence
CVE-2026-5392 and is rated Medium severity with a CVSS score of 5.4. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.
CISA KEVNot listedBased on the latest collected catalog
EPSS0.2%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-5392?
Heap out-of-bounds read in PKCS7 parsing. A crafted PKCS7 message can trigger an OOB read on the heap.
The missing bounds check is in the indefinite-length end-of-content verification loop in PKCS7_VerifySignedData().