CVE-2026-96276

Summary

If a malicious SDK container declares an extension point with a crafted directory path, and a developer runs flatpak build-init --writable-sdk --sdk-extension with that SDK, attacker-chosen files could be written outside the working directory, since the target path is resolved via a function that allows .. traversal.

Affected Software

Weaknesses

• CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Workarounds

Fixed in v1.18.1. Avoid using an non-trusted SDK for development/compilation.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: total

References

• https://access.redhat.com/security/cve/CVE-2026-96276
• https://bugzilla.redhat.com/show_bug.cgi?id=2539418
• https://github.com/flatpak/flatpak/security/advisories/GHSA-8qxj-x646-phcm

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