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CVE-2026-96276— Flatpak: flatpak: arbitrary write in host context via flatpak build-init

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

If a malicious SDK container declares an extension point with a crafted path, and a developer runs 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.

AI Predicted 7.8 Difficulty: Moderate
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I. Basic Information for CVE-2026-96276

Vulnerability Information

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Vulnerability Title
Flatpak: flatpak: arbitrary write in host context via flatpak build-init
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-96276

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III. Intelligence Information for CVE-2026-96276

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Other References for CVE-2026-96276 (2)

Same Patch Batch · Red Hat · 2026-09-23 · 8 CVEs total

CVE-2026-96275 8.8 HIGH Flatpak: flatpak: arbitrary write access as root via extra-data extraction
CVE-2026-96512 7.8 HIGH Sudo: sudo: tz environment variable allows bypass of notbefore/notafter time-based authori
CVE-2026-96442 7.8 HIGH Emacs: emacs: arbitrary code execution, incomplete fix for cve-2024-53920
CVE-2026-88830 7.5 HIGH Busybox: busybox: tls montgomery reduction allocates bytes instead of digits, causing a pr
CVE-2026-88832 7.3 HIGH Busybox: busybox: romfs volume id parsing performs unbounded memcpy into fixed-size label
CVE-2026-96445 6.8 MEDIUM Keycloak-services: keycloak-services: conditional otp skip-header policy evaluated against
CVE-2026-96446 4.2 MEDIUM Keycloak-services: keycloak-services: par single-use bypass via prompt=none silent authent

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-22

V. Comments for CVE-2026-96276

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