CVE-2025-4035

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
4.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
redhatCNA
4.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CISA-ADPADP
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Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 6%
Debian logo
Debian Releases
Debian Product
Codename
libsoup2.4
bullseye
vulnerable
bullseye (security)
vulnerable
bookworm
vulnerable
sid
vulnerable
trixie
vulnerable
libsoup3
bookworm
vulnerable
sid
vulnerable
trixie
vulnerable
Common Weakness Enumeration
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