CVE-2025-11021: 
Linux Debian vulnerability analysis and mitigation

A vulnerability (CVE-2025-11021) was discovered in the cookie date handling logic of the libsoup HTTP library, which is widely used by GNOME and other applications for web communication. The vulnerability was disclosed on September 26, 2025, and affects multiple versions of libsoup across various Red Hat Enterprise Linux distributions. This flaw allows attackers to perform an out-of-bounds memory read when processing cookies with specially crafted expiration dates (Red Hat XML, NVD).

The vulnerability is classified as CWE-125 (Out-of-bounds Read) with a CVSS v3.1 base score of 7.5 (High). The attack vector is network-accessible (AV:N) with low attack complexity (AC:L), requiring no privileges (PR:N) or user interaction (UI:N). The scope is unchanged (S:U) with high confidentiality impact (C:H) but no impact on integrity (I:N) or availability (A:N). The root cause is identified as insufficient bounds checking in the cookie date formatting logic (Red Hat XML).

The vulnerability could result in unintended disclosure of memory contents, potentially exposing sensitive information from processes using libsoup. While AddressSanitizer builds demonstrated crashes, the practical production impact is more likely limited to memory disclosure through malformed cookie headers (Red Hat XML).

Currently, no immediate mitigation options are available that meet Red Hat Product Security criteria for ease of use, deployment, and stability. It is strongly recommended to apply vendor-supplied patches once they become available (Red Hat XML).