Arbitrary file write via caller-controlled sandbox base
Published Jul 29, 2026 · Updated Jul 29, 2026
Path traversal in Flyto2 Core before 2.26.6 allows remote attackers to write attacker-controlled bytes outside the filesystem sandbox. The image.download module checks output_path against caller-controlled output_dir rather than FLYTO_SANDBOX_DIR, so the caller selects both the target and its supposed confinement base. The module is reachable through generic MCP and hosted HTTP execution interfaces without authentication, and exploitation can overwrite any file writable by the service process.
Summary
What happened
Path traversal in Flyto2 Core before 2.26.6 allows remote attackers to write attacker-controlled bytes outside the filesystem sandbox. The image.download module checks output_path against caller-controlled output_dir rather than FLYTO_SANDBOX_DIR, so the caller selects both the target and its supposed confinement base. The module is reachable through generic MCP and hosted HTTP execution interfaces without authentication, and exploitation can overwrite any file writable by the service process.
The record
- CVE
- CVE-2026-67429
- Published
- Jul 29, 2026
- Updated
- Jul 29, 2026
- Vendor
- Flyto2
- Product
- Flyto2 Core
- Classifications
- CWE-73, CWE-22, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 29, 2026CVE publishedPublication date reported by the CVE source.
- Jul 29, 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=< 2.26.6
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
- GHSA-2956-977x-2w3r reproductionproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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