ZDI-26-628: Backblaze Personal Computer Backup bzreports Link Following Denial-of-Service Vulnerability

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Sep 9, 2026 · Catalog

   Detected

   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 6.1. The following CVEs are assigned: CVE-2026-19820.

Sources

• CVE.orgVulnerability recordCVE-2026-19820

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-19820

  30-day exploitation probability 0.3%

  first.org
• Zero Day InitiativeCoordinated disclosureZDI-26-624

  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 6.1. The following CVEs are assigned: CVE-2026-19820.

  zerodayinitiative.com
• Zero Day InitiativeCoordinated disclosureZDI-26-625

  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 6.1. The following CVEs are assigned: CVE-2026-19820.

  zerodayinitiative.com
• Zero Day InitiativeCoordinated disclosureZDI-26-626

  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 6.1. The following CVEs are assigned: CVE-2026-19820.

  zerodayinitiative.com
• Zero Day InitiativeCoordinated disclosureZDI-26-627

  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 6.1. The following CVEs are assigned: CVE-2026-19820.

  zerodayinitiative.com
• Zero Day InitiativeCoordinated disclosureZDI-26-628

  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 6.1. The following CVEs are assigned: CVE-2026-19820.

  zerodayinitiative.com