CVE-2025-4035

4.3 MEDIUM 0.4% exploit odds No fix listed Other Web app

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.
Exploit odds: 0.4% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2025-04-29 13:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-11-05 16:17 UTC Last updatedMost recent change to the record

Details

Published: 2025-04-29 13:15 UTC
Last modified: 2026-11-05 16:17 UTC
Exploit probability: 0.4% · EPSS, next 30 days
Weakness: CWE-178
Record status: Deferred

Attack profile CVSS 3.1 · 4.3

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

Raw vector

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

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References

NVD record · CVE.org record