CVE intelligence

CVE-2026-2708

Vulnerability intelligence

Published Apr 23, 2026Sources checked Nov 11, 2026

5.3MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-2708 and is rated Medium severity with a CVSS score of 5.3. 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 Release Notes

Vendor-listed releases

3.4.4-16

CISA KEVNot listedBased on the latest collected catalog

EPSS0.3%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-2708?

A request smuggling vulnerability exists in libsoup's HTTP/1 header parsing logic. The soup_message_headers_append_common() function in libsoup/soup-message-headers.c unconditionally appends each header value without validating for duplicate or conflicting Content-Length fields.

This allows an attacker to send HTTP requests containing multiple Content-Length headers with differing values.

Source: NVD