CVE-2026-45225
Heym < 0.0.21 Path Traversal File Upload via upload_file()
CVSS Score
7.6
EPSS Score
0.0%
EPSS Percentile
0th
Heym before 0.0.21 contains a path traversal vulnerability in the file upload endpoint that allows authenticated users to write attacker-controlled files to arbitrary locations by supplying a crafted filename with traversal sequences. Attackers can exploit the unvalidated filename parameter in the upload_file() handler to bypass path restrictions and write, read, or delete files outside the intended storage directory.
| CWE | CWE-22 |
| Vendor | heymrun |
| Product | heym |
| Published | May 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
Low
Affected Versions
heymrun / heym
0 < 0.0.21
References
github.com: https://github.com/heymrun/heym/releases/tag/v0.0.21 github.com: https://github.com/heymrun/heym/pull/92 github.com: https://github.com/heymrun/heym/commit/835843e6d2bf7d018cbb8e50f28f0426eaa20c84 vulncheck.com: https://www.vulncheck.com/advisories/heym-path-traversal-file-upload-via-upload-file
Credits
Chia Min Jun Lennon