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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | — | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | — | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | yelp | 49.1-1 | — |
| Debian 13 | yelp | 42.2-4+deb13u1 | — |
| Debian 12 | yelp | 42.2-1+deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | yelp | 49.0-5ubuntu0.1 | — |
| Ubuntu 25.10 | yelp | No fix yet | — |
| Ubuntu 24.04 LTS | yelp | 42.2-1ubuntu0.24.04.2 | — |
| Ubuntu 22.04 LTS | yelp | 42.1-1ubuntu0.2 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | yelp | 3.36.2-0ubuntu1.1+esm1 | — |
| Ubuntu Pro 18.04 LTS | yelp | 3.26.0-1ubuntu2+esm1 | — |
| Ubuntu Pro 16.04 LTS | yelp | 3.18.1-1ubuntu4+esm1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | yelp +2 | 2:40.3-3.el9_8.1 | RHSA-2026:47178 |
| RHEL 8 | yelp +2 | 2:3.28.1-3.el8_10.2 | RHSA-2026:47177 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.6 EUS | yelp +2 | 2:40.3-2.el9_6.2 | RHSA-2026:54539 |
| RHEL 9.4 E4S | yelp +1 | 2:40.3-2.el9_4.2 | RHSA-2026:54540 |
| RHEL 9.2 E4S | yelp +1 | 2:40.3-2.el9_2.2 | RHSA-2026:54637 |
| RHEL 8.8 TUS | yelp +1 | 2:3.28.1-3.el8_8.2 | RHSA-2026:54624 |
| RHEL 8.8 E4S | yelp +1 | 2:3.28.1-3.el8_8.2 | RHSA-2026:54624 |
| RHEL 8.6 EUS Long Life | yelp +1 | 2:3.28.1-3.el8_6.2 | RHSA-2026:54666 |
| RHEL 8.6 AUS | yelp +1 | 2:3.28.1-3.el8_6.2 | RHSA-2026:54666 |
| RHEL 8.4 EUS Long Life | yelp +1 | 2:3.28.1-3.el8_4.2 | RHSA-2026:54605 |
| RHEL 8.4 AUS | yelp +1 | 2:3.28.1-3.el8_4.2 | RHSA-2026:54605 |
| RHEL 7 ELS | yelp +2 | 2:3.28.1-2.el7_9 | RHSA-2026:57417 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | yelp +2 | 2:40.3-3.el9_8.1 | ALSA-2026:47178 |
| AlmaLinux 8 | yelp +2 | 2:3.28.1-3.el8_10.2 | ALSA-2026:47177 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | yelp | 2:40.3-3.el9_8.1 | RLSA-2026:47178 |
| Rocky Linux 8 | yelp | 2:3.28.1-3.el8_10.2 | RLSA-2026:47177 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | yelp | 42.2-150600.3.6.1 | SUSE-SU-2026:3036-1 |
| SLES 15 SP6 | yelp | 42.2-150600.3.6.1 | SUSE-SU-2026:3036-1 |
| SLES 15 SP5 | yelp | 41.2-150400.3.6.1 | SUSE-SU-2026:3037-1 |
| SLES 15 SP4 | yelp | 41.2-150400.3.6.1 | SUSE-SU-2026:3037-1 |
| SLES 12 SP5 | yelp | 3.20.1-7.6.1 | SUSE-SU-2026:3035-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | yelp | 42.3-160000.3.1 | SUSE-SU-2026:22625-1 |
| SLES for SAP 15 SP6 | yelp | 42.2-150600.3.6.1 | SUSE-SU-2026:3036-1 |
| SLES for SAP 15 SP5 | yelp | 41.2-150400.3.6.1 | SUSE-SU-2026:3037-1 |
| SLES for SAP 15 SP4 | yelp | 41.2-150400.3.6.1 | SUSE-SU-2026:3037-1 |
| SLES 16.0 | yelp | 42.3-160000.3.1 | SUSE-SU-2026:22625-1 |
| SLE HPC 15 SP5 | yelp | 41.2-150400.3.6.1 | SUSE-SU-2026:3037-1 |
| SLE HPC 15 SP4 | yelp | 41.2-150400.3.6.1 | SUSE-SU-2026:3037-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | yelp | 42.3-160000.3.1 | openSUSE-SU-2026:21295-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | yelp +2 | 2:3.28.1-1.amzn2.0.2 | ALAS2-2026-3821 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | yelp +2 | 2:40.3-3.el9_8.1 | ELSA-2026-47178 |
| Oracle Linux 8 | yelp +2 | 2:3.28.1-3.el8_10.2 | ELSA-2026-47177 |
| Oracle Linux 7 | yelp +2 | 2:3.28.1-1.0.1.el7 | ELSA-2026-57417 |
Advisories 23
- ALSA-2026:47178 Important: yelp security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:47177 Important: yelp security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-2835 Red Hat Enterprise Linux (yelp, dracut): Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 27, 2026
- ELSA-2026-57417 Important: yelp security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 24, 2026
- RHSA-2026:57417 Red Hat Security Advisory: yelp security update Red Hat Security Advisories (RHSA) · Aug 21, 2026
- RHSA-2026:54666 Red Hat Security Advisory: yelp security update Red Hat Security Advisories (RHSA) · Aug 21, 2026
- RHSA-2026:54637 Red Hat Security Advisory: yelp security update Red Hat Security Advisories (RHSA) · Aug 21, 2026
- RHSA-2026:54605 Red Hat Security Advisory: yelp security update Red Hat Security Advisories (RHSA) · Aug 21, 2026
- RHSA-2026:54624 Red Hat Security Advisory: yelp security update Red Hat Security Advisories (RHSA) · Aug 21, 2026
- RHSA-2026:54540 Red Hat Security Advisory: yelp security update Red Hat Security Advisories (RHSA) · Aug 21, 2026
- RHSA-2026:54539 Red Hat Security Advisory: yelp security update Red Hat Security Advisories (RHSA) · Aug 21, 2026
- RHSA-2026:47177 Red Hat Security Advisory: yelp security update Red Hat Security Advisories (RHSA) · Aug 21, 2026
- RHSA-2026:47178 Red Hat Security Advisory: yelp security update Red Hat Security Advisories (RHSA) · Aug 21, 2026
- RLSA-2026:47177 Important: yelp security update Rocky Linux Security Advisories · Aug 3, 2026
- RLSA-2026:47178 Important: yelp security update Rocky Linux Security Advisories · Aug 3, 2026
- ELSA-2026-47178 Important: yelp security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 29, 2026
- ELSA-2026-47177 Important: yelp security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 28, 2026
- ALAS2-2026-3821 Important: yelp security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 20, 2026
- SUSE-SU-2026:22625-1 Security update for yelp SUSE / openSUSE Security Updates · Jul 17, 2026
- SUSE-SU-2026:3037-1 Security update for yelp SUSE / openSUSE Security Updates · Jul 16, 2026
- SUSE-SU-2026:3035-1 Security update for yelp SUSE / openSUSE Security Updates · Jul 16, 2026
- SUSE-SU-2026:3036-1 Security update for yelp SUSE / openSUSE Security Updates · Jul 16, 2026
- openSUSE-SU-2026:21295-1 Security update for yelp SUSE / openSUSE Security Updates · Jul 13, 2026
References
- RHSA-2026:47177 vendor-advisory
- RHSA-2026:47178 vendor-advisory
- RHSA-2026:54539 vendor-advisory
- RHSA-2026:54540 vendor-advisory
- RHSA-2026:54605 vendor-advisory
- RHSA-2026:54624 vendor-advisory
- RHSA-2026:54637 vendor-advisory
- RHSA-2026:54666 vendor-advisory
- RHSA-2026:57417 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-13601 vdb-entry
- https://blogs.gnome.org/mcatanzaro/2026/05/11/flatpak-sandbox-escape-via-yelp/
- RHBZ#2494110 issue-tracking
- https://gitlab.gnome.org/GNOME/yelp/-/commit/c8c8244c8a812860782d635890c9b6c43ecc2639
- https://gitlab.gnome.org/GNOME/yelp/-/work_items/238