CVE-2025-4035

Name: CVE-2025-4035
Creator: NVD / NIST
Published: 2025-04-29T13:15:45.407+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.33%

Last modified Jun 26, 2026

CVE-2025-4035 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS Probability

0.33%

24.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-178

References

Timeline

Published: Apr 29, 2025
Last Modified: Jun 26, 2026
Status: Deferred

Frequently Asked Questions

What is CVE-2025-4035?

How severe is CVE-2025-4035?

CVE-2025-4035 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2025-4035?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-4035?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST