Out-of-directory file writes via unnormalized archive paths
Published Jan 1, 2026 · Updated Jan 1, 2026
Path traversal in Solus Project eopkg before 4.4.0 allows attackers to write package files outside a specified destination directory. During archive extraction, pisi/archive.py used tar member paths without first removing absolute or parent-directory components, so crafted names escaped --destdir. Exploitation requires a malicious or compromised package source and an administrator to install the package; official Solus repositories are unaffected.
Summary
What happened
Path traversal in Solus Project eopkg before 4.4.0 allows attackers to write package files outside a specified destination directory. During archive extraction, pisi/archive.py used tar member paths without first removing absolute or parent-directory components, so crafted names escaped --destdir. Exploitation requires a malicious or compromised package source and an administrator to install the package; official Solus repositories are unaffected.
The record
- CVE
- CVE-2026-21436
- Published
- Jan 1, 2026
- Updated
- Jan 1, 2026
- Vendor
- Solus Project
- Product
- eopkg
- Classifications
- CWE-24, T1203
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jan 1, 2026CVE publishedPublication date reported by the CVE source.
- Jan 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 4.4.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- nano-malicious-8.6-206-1-x86_64.eopkg test packageproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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