CVE intelligence

CVE-2026-77014

Vulnerability intelligence

Published Aug 20, 2026Sources checked Oct 27, 2026

5.3MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-77014 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

Ubuntu Security Notices guidance

Vendor revision: Oct 21, 2026

USN-8890-1 fixed vulnerabilities in libsoup.

Microsoft Security Response Center guidance

Vendor revision: Oct 13, 2026

Release Notes

Vendor-listed releases

3.4.4-17

CISA KEVNot listedBased on the latest collected catalog

EPSS0.2%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-77014?

A flaw was found in libsoup's SoupServer HTTP Range header processing. The sort_ranges() comparator in soup-message-headers.c truncates a 64-bit subtraction result to 32-bit int, flipping the sign for range offsets differing by more than INT_MAX.

This causes silent omission of requested byte ranges from HTTP 206 Partial Content responses on resources larger than approximately 2 GB.

Source: NVD