Debian dpkg up to 1.23.11 path traversal

Summaryinfo

A vulnerability was found in Debian dpkg up to 1.23.11. It has been rated as very critical. This issue affects some unknown processing. The manipulation leads to path traversal. This vulnerability is referenced as CVE-2026-91094. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Debian dpkg up to 1.23.11 and classified as very critical. This issue affects an unknown function. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A directory traversal bug was discovered when unpacking 3.0 (quilt) source packages, where the packaging tarball could contain the quilt database directory (.pc) with attacker controlled symlinks, where that in combination with patches that would fail to apply, could be used to make the code used to restore the backup files to either modify or remove the files pointed to by the attacker controlled symlinks.

The advisory is shared at git.dpkg.org. The identification of this vulnerability is CVE-2026-91094 since 09/14/2026. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation requires an enhanced level of successful authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/13/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 1.23.12 eliminates this vulnerability.

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Productinfo

Vendor

• Debian

Name

• dpkg

Version

• 1.23.0
• 1.23.1
• 1.23.2
• 1.23.3
• 1.23.4
• 1.23.5
• 1.23.6
• 1.23.7
• 1.23.8
• 1.23.9
• 1.23.10
• 1.23.11

License

• open-source

Website

• Vendor: https://www.debian.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

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