CVE-2025-4035 - CVE House
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Status published Medium CVE-2025-4035

Libsoup: cookie domain validation bypass via uppercase characters in libsoup

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Red Hat would like to thank Jan Różański for reporting this issue.

References

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CVE-2025-9901
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CVE-2025-9820
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Affected Vendor

Affected Software

Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9
Vulnerable Versions:
0:3.6.5-3.el10_0.6

Timeline

Official Publish: April 29th, 2025
Last Modified: June 30th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Weaknesses (CWE)

CWE-178

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.