CVE-2025-4476
libsoup2.4 - security update
Description
A denial-of-service vulnerability has been identified in the libsoup HTTP client library. This flaw can be triggered when a libsoup client receives a 401 (Unauthorized) HTTP response containing a specifically crafted domain parameter within the WWW-Authenticate header. Processing this malformed header can lead to a crash of the client application using libsoup. An attacker could exploit this by setting up a malicious HTTP server. If a user's application using the vulnerable libsoup library connects to this malicious server, it could result in a denial-of-service. Successful exploitation requires tricking a user's client application into connecting to the attacker's malicious server.
How to fix CVE-2025-4476
To remediate CVE-2025-4476, upgrade the affected package to a fixed version below.
- —upgrade to 2.72.0-2+deb11u3 or later
- —upgrade to 2.72.0-2+deb11u3 or later
- —no fix listed
Is CVE-2025-4476 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 2.72.0-2+deb11u3
- from 0, < 2.72.0-2+deb11u3
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L |