Bug 2569865 (CVE-2026-86692)

Summary: CVE-2026-86692 apport: apport: Arbitrary code execution via path traversal in crash report extraction
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in apport. An attacker can achieve arbitrary code execution by providing a crafted crash report to be processed by the crash unpacking tool. Due to insufficient path validation during extraction, files can be created or overwritten outside the target directory. If critical user files are overwritten, malicious commands could be executed with the permissions of the user running the unpacker.
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Description OSIDB Bzimport 2026-11-10 19:20:20 UTC 
In apport before 2.37.0, a path traversal vulnerability allows an attacker who can supply a crafted crash report to cause unintended file creation or overwrite outside the intended extraction directory when the report is processed with apport-unpack.

The key-name validation added for CVE-2026-77113 does not cover base64-encoded keys skipped by ProblemReport.load(binary=False), and ProblemReport.extract_keys() writes them to a file path built from the key without validation. This allows an attacker to create or overwrite arbitrary files writable by the invoking user, such as .bashrc or .profile, gaining persistence or code execution in that user's context.