ZDI-26-749: WatchGuard FireWare OS samld SAMLSession Deserialization of Untrusted Data Remote Code Execution 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 30, 2026 · Catalog

   Detected

   This vulnerability allows remote attackers to execute arbitrary code on affected installations of WatchGuard FireWare OS. An attacker must first obtain the ability to write to the samld session directory on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.5. The following CVEs are assigned: CVE-2026-13046.

Sources

• CVE.orgVulnerability recordCVE-2026-13046

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-13046

  30-day exploitation probability 0.4%

  first.org
• Zero Day InitiativeCoordinated disclosureZDI-26-749

  This vulnerability allows remote attackers to execute arbitrary code on affected installations of WatchGuard FireWare OS. An attacker must first obtain the ability to write to the samld session directory on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.5. The following CVEs are assigned: CVE-2026-13046.

  zerodayinitiative.com