CVE-2026-96276
Flatpak: flatpak: arbitrary write in host context via flatpak build-init
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What happened?
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 and versions
| Software | Version information | Fixed version |
|---|---|---|
| flatpakRed Hat | Default status: affected | See vendor advisory |
| flatpakRed Hat | Default status: affected | See vendor advisory |
| flatpakRed Hat | Default status: affected | See vendor advisory |
| flatpakRed Hat | Default status: affected | See vendor advisory |
Version information comes from the source record and can include unaffected products and exceptions. Distribution packages may contain backported fixes: an older upstream version alone does not prove a server is affected.
Is it being exploited?
This CVE was not listed in the CISA catalogue at our last retrieval. This does not establish that exploitation is absent.
How to respond
- Confirm the product, installed package version, and any configuration requirements in the vendor advisory.
- Follow the vendor’s remediation or workaround guidance in the references below. Structured fixed-version data is unavailable here; the publisher’s description may include a fix or workaround.
- Restart affected services if required, then verify the running version. Known exploitation may warrant investigation as well as patching.