# CVE-2025-11021: Libsoup: out-of-bounds read in cookie date handling of libsoup http library > An out-of-bounds read in libsoup's cookie date handling allows attackers to disclose sensitive memory contents from applications using the library. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 26 Sep 2025 - **Updated:** 29 Jun 2026 - **Also known as:** ALSA-2025:18183, AZL-67860, AZL-67875, DEBIAN-CVE-2025-11021, ECHO-692b-622b-7965, GHSA-fjfx-vwp2-gqr8, RHSA-2025:18183, RLSA-2025:18183, ROOT-OS-DEBIAN-13-CVE-2025-11021, SUSE-SU-2025:20937-1, SUSE-SU-2025:20965-1, SUSE-SU-2025:3752-1, SUSE-SU-2025:3753-1, UBUNTU-CVE-2025-11021, openSUSE-SU-2025:15633-1 ## What is CVE-2025-11021? CVE-2025-11021 is a high-severity vulnerability in Red Hat Enterprise Linux 10, published on 26 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description A flaw was found in the cookie date handling logic of the libsoup HTTP library, widely used by GNOME and other applications for web communication. When processing cookies with specially crafted expiration dates, the library may perform an out-of-bounds memory read. This flaw could result in unintended disclosure of memory contents, potentially exposing sensitive information from the process using libsoup. Weakness: CWE-125 (Out-of-bounds Read) ## Which versions are affected by CVE-2025-11021? | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `libsoup3-doc` | AlmaLinux:10 | All versions | 3.6.5-3.el10_0.7 | | `libsoup3` | Red Hat:enterprise_linux:10.0 | All versions | 0:3.6.5-3.el10_0.7 | | `libsoup3-debuginfo` | Red Hat:enterprise_linux:10.0 | All versions | 0:3.6.5-3.el10_0.7 | | `libsoup3-debugsource` | Red Hat:enterprise_linux:10.0 | All versions | 0:3.6.5-3.el10_0.7 | | `libsoup3-devel` | Red Hat:enterprise_linux:10.0 | All versions | 0:3.6.5-3.el10_0.7 | | `libsoup3-doc` | Red Hat:enterprise_linux:10.0 | All versions | 0:3.6.5-3.el10_0.7 | | `libsoup3` | Rocky Linux:10 | All versions | 0:3.6.5-3.el10_0.7 | | `libsoup` | SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | All versions | 3.0.4-150400.3.18.1 | | `libsoup` | SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | All versions | 3.0.4-150400.3.18.1 | | `libsoup` | SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | All versions | 3.0.4-150400.3.18.1 | | `libsoup` | SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | All versions | 3.0.4-150400.3.18.1 | | `libsoup` | SUSE:Linux Enterprise Module for Basesystem 15 SP6 | All versions | 3.4.4-150600.3.18.1 | | `libsoup` | SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 3.4.4-150600.3.18.1 | | `libsoup` | SUSE:Linux Enterprise Server 15 SP4-LTSS | All versions | 3.0.4-150400.3.18.1 | | `libsoup` | SUSE:Linux Enterprise Server 15 SP5-LTSS | All versions | 3.0.4-150400.3.18.1 | | `libsoup` | SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | All versions | 3.0.4-150400.3.18.1 | | `libsoup` | SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | All versions | 3.0.4-150400.3.18.1 | | `libsoup` | SUSE:Linux Micro 6.0 | All versions | 3.4.2-9.1 | | `libsoup` | SUSE:Linux Micro 6.1 | All versions | 3.4.4-slfo.1.1_5.1 | | `libsoup` | SUSE:Manager Proxy LTS 4.3 | All versions | 3.0.4-150400.3.18.1 | | `libsoup` | SUSE:Manager Server LTS 4.3 | All versions | 3.0.4-150400.3.18.1 | | `libsoup` | openSUSE:Leap 15.6 | All versions | 3.4.4-150600.3.18.1 | | `libsoup` | openSUSE:Tumbleweed | All versions | 3.6.5-7.1 | ## How do I fix CVE-2025-11021? Apply the vendor's patch. ## Is CVE-2025-11021 being exploited? There is no known exploitation of CVE-2025-11021 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2025-11021 and fix it if it is affected. What it is: CVE-2025-11021 is a high-severity vulnerability in Red Hat Enterprise Linux 10, published on 26 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2025-11021 in the wild and no public exploit code. Affected product: Red Hat Enterprise Linux 10. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2025-11021/ (Markdown: https://insights.sbomify.com/CVE-2025-11021/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2025-11021 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-11021 - OSV: https://osv.dev/vulnerability/CVE-2025-11021 --- From sbomify Insights: https://insights.sbomify.com/CVE-2025-11021/ Summaries are generated and may contain mistakes; the official description above is the record.