CVE-2026-45225
CVE-2026-45225 is a high-severity vulnerability with a CVSS 3.x base score of 7.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.
Key facts
- Severity: High (CVSS 3.x base score 7.6)
- CVSS v4: 7.2
- EPSS exploit prediction: 0% (28th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-29850
- Weakness: CWE-22
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-45225?
- 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.
- How severe is CVE-2026-45225?
- CVE-2026-45225 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability low.
- Is CVE-2026-45225 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-45225?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-45225 have an EU (EUVD) identifier?
- Yes. CVE-2026-45225 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29850.
- When was CVE-2026-45225 published?
- CVE-2026-45225 was published on 2026-05-12 and last updated on 2026-06-17.
References
- https://github.com/heymrun/heym/commit/835843e6d2bf7d018cbb8e50f28f0426eaa20c84
- https://github.com/heymrun/heym/pull/92
- https://github.com/heymrun/heym/releases/tag/v0.0.21
- https://www.vulncheck.com/advisories/heym-path-traversal-file-upload-via-upload-file
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