CVE-2025-4035

4.3 mediumEPSS 0.4%

Medium (4.3). EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

4.3 medium

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 38% of CVEs (scores of 2026-10-31)
CWE: CWE-178
Published: 2025-04-29
Modified: 2026-06-30
Record from: the NVD, synced 2026-10-19

References

https://access.redhat.com/errata/RHSA-2025:8128
https://access.redhat.com/security/cve/CVE-2025-4035
https://bugzilla.redhat.com/show_bug.cgi?id=2362651
https://gitlab.gnome.org/GNOME/libsoup/-/issues/443
https://gitlab.gnome.org/GNOME/libsoup/-/work_items/443

Check your stack JSON