CVE-2025-4035
mediumpriority · track · 0EPSS 0.004 · 38 %ileEURUUSEPSS · scored 2026-10-28
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (15)
Products and version ranges known to be affected.
also known as (5)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (12)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2025-4035cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2025-4035cnnvd
- https://vigilance.fr/vulnerability/libsoup-write-access-via-Uppercase-Character-Cookies-47268cnnvd
- https://access.redhat.com/errata/RHSA-2025:8128enisa_euvd
- https://access.redhat.com/security/cve/CVE-2025-4035enisa_euvd
- https://bugzilla.redhat.com/show_bug.cgi?id=2362651enisa_euvd
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/443enisa_euvd
- https://access.redhat.com/errata/RHSA-2025:8128nvd
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan