Information Exposure Through Caching Affecting libsoup2.4 package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.07% (22nd percentile)

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  • Snyk IDSNYK-UBUNTU2004-LIBSOUP24-12488652
  • published5 Nov 2025
  • disclosed3 Sept 2025

Introduced: 3 Sep 2025

CVE-2025-9901  (opens in a new tab)
CWE-524  (opens in a new tab)

How to fix?

There is no fixed version for Ubuntu:20.04 libsoup2.4.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libsoup2.4 package and not the libsoup2.4 package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

A flaw was found in libsoup’s caching mechanism, SoupCache, where the HTTP Vary header is ignored when evaluating cached responses. This header ensures that responses vary appropriately based on request headers such as language or authentication. Without this check, cached content can be incorrectly reused across different requests, potentially exposing sensitive user information. While the issue is unlikely to affect everyday desktop use, it could result in confidentiality breaches in proxy or multi-user environments.

CVSS Base Scores

version 3.1