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Description

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.

PUBLISHED Reserved 2026-05-11 | Published 2026-05-12 | Updated 2026-05-14 | Assigner VulnCheck




HIGH: 7.2CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

HIGH: 7.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

Problem types

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Product status

Default status
affected

Any version before 0.0.21
affected

835843e6d2bf7d018cbb8e50f28f0426eaa20c84 (git)
unaffected

Credits

Chia Min Jun Lennon finder

References

github.com/heymrun/heym/pull/92 exploit

github.com/heymrun/heym/releases/tag/v0.0.21 release-notes

github.com/heymrun/heym/pull/92 issue-tracking

github.com/...ommit/835843e6d2bf7d018cbb8e50f28f0426eaa20c84 patch

www.vulncheck.com/...h-traversal-file-upload-via-upload-file third-party-advisory

cve.org (CVE-2026-45225)

nvd.nist.gov (CVE-2026-45225)

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