Use After Free Affecting libsoup3 package, versions <3.6.6-1+e3


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.86% (58th percentile)

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  • Snyk IDSNYK-ECHOLATEST-LIBSOUP3-18021766
  • published20 Jul 2026
  • disclosed17 Mar 2026

Introduced: 17 Mar 2026

CVE-2026-4271  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Echo:latest libsoup3 to version 3.6.6-1+e3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libsoup3 package and not the libsoup3 package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).

CVSS Base Scores

version 3.1