Published Aug 25, 2026Sources checked Oct 28, 2026
2.1LOWCVSS out of 10
What this means
Review the available evidence
CVE-2026-15310 and is rated Low severity with a CVSS score of 2.1. 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: Oct 7, 2026
Release Notes
Vendor-listed releases
3.12.15-1
CISA KEVNot listedBased on the latest collected catalog
EPSS0.5%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-15310?
When decompressing crafted zip files using the bzip/LZMA/Zstandard
compressions, Python could use an attacker-controlled size to
pre-allocate memory, possibly resulting in memory exhaustion.