CVE-2025-4476
MEDIUMCVSS v3.1: 4.3 · EPSS: 0.0031 (22.5 percentile)
Source data as of:
At a glance
- Severity
- MEDIUM
- CVSS
- 4.3 v3.1 · NVD
- EPSS
- 0.0031 (22.5 percentile) · FIRST.org
- CISA KEV
- No
- Type
- NULL Pointer Deref · NVD CWE
- Attack conditions (CVSS vector)
- NetworkNo privileges · Source: NVD Vector
- Published
- 2025-05-16 · Modified: 2026-06-25
- References
- Jump to references (4)
CVSS / EPSS / KEV
Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources
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.
References
Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.