Published Apr 30, 2026Sources checked Nov 12, 2026
9.1CRITICALCVSS out of 10
What this means
Review the available evidence
CVE-2026-33845 and is rated Critical severity with a CVSS score of 9.1. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.
What to do next
Remediation and response
Microsoft Security Response Center guidance
Vendor revision: Sep 25, 2026
CBL-Mariner Releases
Vendor-listed releases
3.8.3-9
CISA KEVNot listedBased on the latest collected catalog
EPSS2.1%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-33845?
A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information disclosure or denial of service.