CVE-2026-13601

Summary

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 Software

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support2:3.28.1-2.el7_9 < *unaffected
Red HatRed Hat Enterprise Linux 82:3.28.1-3.el8_10.2 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support2:3.28.1-3.el8_4.2 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On2:3.28.1-3.el8_4.2 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support2:3.28.1-3.el8_6.2 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On2:3.28.1-3.el8_6.2 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service2:3.28.1-3.el8_8.2 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions2:3.28.1-3.el8_8.2 < *unaffected
Red HatRed Hat Enterprise Linux 92:40.3-3.el9_8.1 < *unaffected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions2:40.3-2.el9_2.2 < *unaffected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions2:40.3-2.el9_4.2 < *unaffected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support2:40.3-2.el9_6.2 < *unaffected

Weaknesses

  • CWE-693: Protection Mechanism Failure

Workarounds

No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability. Customers are advised to apply the appropriate security update when they becomes available.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from Flatpak Applications

Additional References

References