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Vulnerability record · CVE-2025-68435 · published 17 December 2025

CVE-2025-68435: Nicotsx zerobyte vulnerability

NNicotsx · Zerobyte

Zerobyte is a backup automation tool Zerobyte versions prior to 0.18.5 and 0.19.0 contain an authentication bypass vulnerability where authentication middleware is not properly applied to API endpoints. This results in certain API endpoints being accessible without valid session credentials. This is dangerous for those who have exposed Zerobyte to be used outside of their internal network. A fix has been applied in both version 0.19.0 and 0.18.5. If immediate upgrade is not possible, restrict network access to the Zerobyte instance to trusted networks only using firewall rules or network segmentation. This is only a temporary mitigation; upgrading is strongly recommended.

9.1 CVSS 3.1 Critical EPSS 0.41% · top 67.1% CWE-305 · CWE-305
9.1CVSS 3.1 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

Zerobyte is a backup automation tool Zerobyte versions prior to 0.18.5 and 0.19.0 contain an authentication bypass vulnerability where authentication middleware is not properly applied to API endpoints. This results in certain API endpoints being accessible without valid session credentials. This is dangerous for those who have exposed Zerobyte to be used outside of their internal network. A fix has been applied in both version 0.19.0 and 0.18.5. If immediate upgrade is not possible, restrict network access to the Zerobyte instance to trusted networks only using firewall rules or network segmentation. This is only a temporary mitigation; upgrading is strongly recommended.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nicotsx/zerobyte/commit/13e080a18967705bd2b4e110e5f7693fdca1c692 Patch
https://github.com/nicotsx/zerobyte/issues/161 Issue Tracking
https://github.com/nicotsx/zerobyte/security/advisories/GHSA-x539-c98q-38gv MitigationPatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-68435), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.