Published Sep 11, 2026Sources checked Nov 11, 2026
5.7MEDIUMCVSS out of 10
What this means
Review the available evidence
CVE-2026-87910 and is rated Medium severity with a CVSS score of 5.7. 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
EPSS0.6%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-87910?
When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link.
For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None.