CVE-2025-4035

Libsoup: cookie domain validation bypass via uppercase characters in libsoup

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.

Category

4.3
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 10
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 9
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2025:8128 vendor advisory
https://access.redhat.com/security/cve/CVE-2025-4035 vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2362651 issue tracking

Frequently Asked Questions

What is the severity of CVE-2025-4035?
CVE-2025-4035 has been scored as a medium severity vulnerability.
How to fix CVE-2025-4035?
To fix CVE-2025-4035, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-4035 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-4035 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-4035?
CVE-2025-4035 affects Red Hat Red Hat Enterprise Linux 10, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 9.
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