ZDI-26-627: Backblaze Personal Computer Backup bztransmit Link Following Denial-of-Service Vulnerability
ZDI published ZDI-26-627 for a local denial-of-service flaw (CVE-2026-19820, CVSS 6.1) in Backblaze Personal Computer Backup's bztransmit component.
The Zero Day Initiative published advisory ZDI-26-627 describing a link-following denial-of-service vulnerability in the bztransmit component of Backblaze Personal Computer Backup. Local attackers must first execute low-privileged code on the target system to trigger the condition. The issue carries a CVSS score of 6.1 and is tracked as CVE-2026-19820.
- Local link-following denial-of-service in Backblaze bztransmit
- Requires prior low-privileged code execution to exploit
- CVSS 6.1, tracked as CVE-2026-19820
- CVEs
- CVE-2026-19820
- Vendors
- BackblazeZero Day Initiative
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-19820 | Unbootable-System Denial of Service via Link Following in Backblaze Windows Backup Client | 7.8 | <1% |
From the original article
This vulnerability allows local attackers to create a denial-of-service condition on affected installations of Backblaze Personal Computer Backup. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 6.
zerodayinitiative.com
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