CVE-2026-11853
Deferred Deferred - Pending Action

Arbitrary File Overwrite via Symbolic Links in Debusine

Publication date: 2026-06-10

Last updated on: 2026-06-10

Assigner: Debian GNU/Linux

Description
Debusine is an integrated solution to build, distribute and maintain a Debian-based distribution. Debian source packages (.dsc) and upload artifacts (.changes) are manifest files that name the files that make up the artifact. The parser used to read these files in Debusine accepted arbitrary fully user-controlled paths. The mergeuploads task could be abused to create arbitrary symbolic links on a worker, overwriting any file that the worker user has access to.

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Meta Information

Published
2026-06-10
Last Modified
2026-06-10
Generated
2026-06-30
AI Q&A
2026-06-10
EPSS Evaluated
2026-06-29
NVD
CVE-2026-11853
EUVD
EUVD-2026-35999

Affected Vendors & Products

Currently, no data is known.

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-59 The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

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Impact Analysis

The vulnerability allows an attacker to create arbitrary symbolic links and overwrite files on the worker system with the permissions of the worker user. This could lead to unauthorized modification or corruption of files, potentially disrupting the build or distribution process, causing data loss, or enabling further exploitation depending on which files are overwritten.

Executive Summary

This vulnerability exists in Debusine, a solution used to build, distribute, and maintain Debian-based distributions. The issue lies in the parser that reads Debian source package files (.dsc) and upload artifact files (.changes). This parser accepted arbitrary, fully user-controlled file paths. As a result, the mergeuploads task could be exploited to create arbitrary symbolic links on a worker system, potentially overwriting any file that the worker user has permission to access.

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