Relative Path Traversal in libzypp Repository Parsing

Executive Summary

CVE-2026-44941 is a path traversal vulnerability in libzypp, a software library used by package management tools like zypper and YaST in SUSE-based systems.

The vulnerability arises from improper validation of the "keyhint" option in repomd.xml files, which allows an attacker who can supply a malicious repository to perform directory traversal.

By crafting a malicious repomd.xml with specially designed keyhint entries, an attacker can overwrite or inject files anywhere on the target system, including sensitive locations, with root privileges.

This can lead to root code execution when a user runs a routine repository refresh using zypper.

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Impact Analysis

This vulnerability can have severe impacts including unauthorized root code execution on affected systems.

An attacker able to supply a malicious repository can exploit the path traversal flaw to overwrite critical system files such as /etc/ld.so.preload, potentially gaining persistent root access.

This compromises system integrity, confidentiality, and availability, allowing attackers to execute arbitrary code with the highest privileges.

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Detection Guidance

This vulnerability can be detected by monitoring for unusual or malicious repomd.xml files served by repositories, especially those containing suspicious "keyhint" entries with path traversal patterns.

One practical approach is to intercept and inspect HTTP repository traffic to check for repomd.xml files with keyhint values containing directory traversal characters such as "../".

You can use commands like curl or wget to fetch the repomd.xml from your configured repositories and then grep for suspicious keyhint entries.

• curl -s <repository_url>/repodata/repomd.xml | grep -i keyhint
• wget -qO- <repository_url>/repodata/repomd.xml | grep -i keyhint

Look for keyhint values that include path traversal sequences (e.g., "../") which indicate a potential exploit attempt.

Additionally, monitoring zypper refresh operations for unexpected root file modifications or unusual behavior can help detect exploitation attempts.

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Mitigation Strategies

The immediate mitigation step is to update libzypp to version 17.38.12 or later, where the vulnerability has been fixed by validating and restricting the "keyhint" filenames to prevent directory traversal.

Ensure that all SUSE-based systems, including openSUSE Tumbleweed, SUSE Linux Enterprise, and openSUSE Leap, apply the security updates that address this issue.

Avoid using untrusted or malicious repositories that could serve crafted repomd.xml files with malicious keyhint entries.

If possible, monitor and restrict network traffic to trusted repository sources only.

Review repository configurations and remove or disable any suspicious or unknown repositories.

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Compliance Impact

The vulnerability allows attackers to inject or overwrite files on the target system as root by exploiting a path traversal flaw in libzypp. This can lead to unauthorized root code execution and potential compromise of system integrity.

Such unauthorized access and control over system files can result in breaches of data confidentiality, integrity, and availability, which are critical requirements under common standards and regulations like GDPR and HIPAA.

If exploited, this vulnerability could lead to exposure or manipulation of sensitive personal or health data, thereby causing non-compliance with these regulations and potentially resulting in legal and financial consequences.

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