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CVE intelligence

CVE-2026-87864

Vulnerability intelligence

Published Oct 20, 2026Sources checked Oct 20, 2026
N/ACVSS not listedScore unavailable
What this means

Review the available evidence

CVE-2026-87864. 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

Ubuntu Security Notices guidance

Vendor revision: Oct 19, 2026

USN-8927-1 fixed vulnerabilities in curl.

CISA KEVNot listedBased on the latest collected catalog
EPSSUnavailableNo current score collected
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview

What is CVE-2026-87864?

Enabling `CURLOPT_CRLF` causes curl to advertise the raw input byte count in the `IMAP APPEND {N}` literal while transmitting line-ending expanded data. The server reads only $N$ bytes for the payload, causing the remaining overflow bytes to be interpreted and executed as pipelined IMAP commands within the authenticated session.

Source: NVD