# CVE-2026-13601: Yelp: yelp-xsl: overly permissive content security policy in yelp allows host file disclosure from flatpak applications > A malicious Flatpak app can bypass sandbox isolation via crafted SVG/CSS in Yelp, disclosing arbitrary host files to the attacker. - **Severity:** High 7.1 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 29 Jun 2026 - **Updated:** 20 Aug 2026 - **Also known as:** ALSA-2026:47177, ALSA-2026:47178, CLSA-2026-1783700414, CLSA-2026-1784539549, DEBIAN-CVE-2026-13601, GHSA-f4vh-qr53-q5gv, MGASA-2026-0296, OESA-2026-3053, RHSA-2026:47177, RHSA-2026:47178, RHSA-2026:54539, RHSA-2026:54540, RHSA-2026:54605, RHSA-2026:54624, RHSA-2026:54637, RHSA-2026:54666, RHSA-2026:57417, RLSA-2026:47177, RLSA-2026:47178, SUSE-SU-2026:22625-1, SUSE-SU-2026:3035-1, SUSE-SU-2026:3036-1, SUSE-SU-2026:3037-1, UBUNTU-CVE-2026-13601, USN-8627-1, openSUSE-SU-2026:21295-1 ## What is CVE-2026-13601? CVE-2026-13601 is a high-severity vulnerability in Redhat Enterprise Linux, published on 29 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description A flaw was found in Yelp due to an overly permissive Content Security Policy (CSP) implementation provided by yelp-xsl. A malicious Flatpak application can open crafted help content through the OpenURI portal. By embedding an untrusted CSS stylesheet within a structured SVG document, attacker-controlled content can bypass Flatpak's intended sandbox isolation, allowing Yelp to evaluate local XML inclusions and disclose arbitrary user-readable host files through remote CSS resource requests. This may result in the unauthorized disclosure of sensitive information. Weakness: CWE-693 (Protection Mechanism Failure) ## Which versions are affected by CVE-2026-13601? It affects 2 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `yelp` | AlmaLinux:8 | All versions | 2:3.28.1-3.el8_10.2 | | `yelp-devel` | AlmaLinux:8 | All versions | 2:3.28.1-3.el8_10.2 | | `yelp-libs` | AlmaLinux:8 | All versions | 2:3.28.1-3.el8_10.2 | | `yelp` | AlmaLinux:9 | All versions | 2:40.3-3.el9_8.1 | | `yelp-devel` | AlmaLinux:9 | All versions | 2:40.3-3.el9_8.1 | | `yelp-libs` | AlmaLinux:9 | All versions | 2:40.3-3.el9_8.1 | | `yelp` | Red Hat:enterprise_linux:8::appstream | All versions | 2:3.28.1-3.el8_10.2 | | `yelp-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 2:3.28.1-3.el8_10.2 | | `yelp-debugsource` | Red Hat:enterprise_linux:8::appstream | All versions | 2:3.28.1-3.el8_10.2 | | `yelp-libs` | Red Hat:enterprise_linux:8::appstream | All versions | 2:3.28.1-3.el8_10.2 | | `yelp-libs-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 2:3.28.1-3.el8_10.2 | | `yelp-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 2:3.28.1-3.el8_10.2 | | `yelp-debugsource` | Red Hat:enterprise_linux:8::crb | All versions | 2:3.28.1-3.el8_10.2 | | `yelp-devel` | Red Hat:enterprise_linux:8::crb | All versions | 2:3.28.1-3.el8_10.2 | | `yelp-libs-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 2:3.28.1-3.el8_10.2 | | `yelp` | Red Hat:enterprise_linux:9::appstream | All versions | 2:40.3-3.el9_8.1 | | `yelp-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 2:40.3-3.el9_8.1 | | `yelp-debugsource` | Red Hat:enterprise_linux:9::appstream | All versions | 2:40.3-3.el9_8.1 | | `yelp-libs` | Red Hat:enterprise_linux:9::appstream | All versions | 2:40.3-3.el9_8.1 | | `yelp-libs-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 2:40.3-3.el9_8.1 | | `yelp-debuginfo` | Red Hat:enterprise_linux:9::crb | All versions | 2:40.3-3.el9_8.1 | | `yelp-debugsource` | Red Hat:enterprise_linux:9::crb | All versions | 2:40.3-3.el9_8.1 | | `yelp-devel` | Red Hat:enterprise_linux:9::crb | All versions | 2:40.3-3.el9_8.1 | | `yelp-libs-debuginfo` | Red Hat:enterprise_linux:9::crb | All versions | 2:40.3-3.el9_8.1 | | `yelp` | Red Hat:rhel_aus:8.4::appstream | All versions | 2:3.28.1-3.el8_4.2 | | `yelp-debuginfo` | Red Hat:rhel_aus:8.4::appstream | All versions | 2:3.28.1-3.el8_4.2 | | `yelp-debugsource` | Red Hat:rhel_aus:8.4::appstream | All versions | 2:3.28.1-3.el8_4.2 | | `yelp-libs` | Red Hat:rhel_aus:8.4::appstream | All versions | 2:3.28.1-3.el8_4.2 | | `yelp-libs-debuginfo` | Red Hat:rhel_aus:8.4::appstream | All versions | 2:3.28.1-3.el8_4.2 | | `yelp` | Red Hat:rhel_aus:8.6::appstream | All versions | 2:3.28.1-3.el8_6.2 | | `yelp-debuginfo` | Red Hat:rhel_aus:8.6::appstream | All versions | 2:3.28.1-3.el8_6.2 | | `yelp-debugsource` | Red Hat:rhel_aus:8.6::appstream | All versions | 2:3.28.1-3.el8_6.2 | | `yelp-libs` | Red Hat:rhel_aus:8.6::appstream | All versions | 2:3.28.1-3.el8_6.2 | | `yelp-libs-debuginfo` | Red Hat:rhel_aus:8.6::appstream | All versions | 2:3.28.1-3.el8_6.2 | | `yelp` | Red Hat:rhel_e4s:8.8::appstream | All versions | 2:3.28.1-3.el8_8.2 | | `yelp-debuginfo` | Red Hat:rhel_e4s:8.8::appstream | All versions | 2:3.28.1-3.el8_8.2 | | `yelp-debugsource` | Red Hat:rhel_e4s:8.8::appstream | All versions | 2:3.28.1-3.el8_8.2 | | `yelp-libs` | Red Hat:rhel_e4s:8.8::appstream | All versions | 2:3.28.1-3.el8_8.2 | | `yelp-libs-debuginfo` | Red Hat:rhel_e4s:8.8::appstream | All versions | 2:3.28.1-3.el8_8.2 | | `yelp` | Red Hat:rhel_e4s:9.2::appstream | All versions | 2:40.3-2.el9_2.2 | Products: Gnome Yelp, Redhat Enterprise Linux. ## How do I fix CVE-2026-13601? Apply the vendor's patch. ## Is CVE-2026-13601 being exploited? There is no known exploitation of CVE-2026-13601 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-13601 and fix it if it is affected. What it is: CVE-2026-13601 is a high-severity vulnerability in Redhat Enterprise Linux, published on 29 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2026-13601 in the wild and no public exploit code. Affected product: Redhat Enterprise Linux. 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-2026-13601/ (Markdown: https://insights.sbomify.com/CVE-2026-13601/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13601 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13601 - OSV: https://osv.dev/vulnerability/CVE-2026-13601 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-13601/ Summaries are generated and may contain mistakes; the official description above is the record.