Vulnerability · Published Apr 29, 2025 · Assigned by redhat
CVE-2025-4035Libsoup: cookie domain validation bypass via uppercase characters in libsoup
Medium 4.3
In plain English
A medium-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | libsoup3-doc | 3.6.5-3.el10_0.6 | ALSA-2025:8128 |
| Debian:14 | libsoup | no fix listed | DEBIAN-CVE-2025-4035 |
| Debian:12 | libsoup2.4 | no fix listed | DEBIAN-CVE-2025-4035 |
| Debian:13 | libsoup2.4 | no fix listed | DEBIAN-CVE-2025-4035 |
| Debian:12 | libsoup3 | no fix listed | DEBIAN-CVE-2025-4035 |
| Debian:13 | libsoup3 | no fix listed | DEBIAN-CVE-2025-4035 |
| Rocky Linux:10 | libsoup3 | 0:3.6.5-3.el10_0.6 | RLSA-2025:8128 |
| Ubuntu:22.04:LTS | libsoup2.4 | no fix listed | UBUNTU-CVE-2025-4035 |
| Ubuntu:24.04:LTS | libsoup2.4 | no fix listed | UBUNTU-CVE-2025-4035 |
| Ubuntu:25.10 | libsoup2.4 | no fix listed | UBUNTU-CVE-2025-4035 |
| Ubuntu:26.10 | libsoup2.4 | no fix listed | UBUNTU-CVE-2025-4035 |
| Ubuntu:24.04:LTS | libsoup3 | no fix listed | UBUNTU-CVE-2025-4035 |
| Ubuntu:25.10 | libsoup3 | no fix listed | UBUNTU-CVE-2025-4035 |
| Ubuntu:26.04:LTS | libsoup3 | no fix listed | UBUNTU-CVE-2025-4035 |
| Ubuntu:26.10 | libsoup3 | no fix listed | UBUNTU-CVE-2025-4035 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
Weakness: CWE-178 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
References
- RHSA-2025:8128 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2025-4035 vdb-entry, x_refsource_REDHAT
- RHBZ#2362651 issue-tracking, x_refsource_REDHAT
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/443
- https://gitlab.gnome.org/GNOME/libsoup/-/work_items/443 exploit