CVE-2026-13046 Fireware OS Deserialization of Untrusted Data in samld Allows Remote Code Execution

What is CVE-2026-13046?

CVE-2026-13046 is a high-severity unsafe deserialization vulnerability in Watchguard Fireware, published on 29 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

A deserialization of untrusted data vulnerability in WatchGuard Fireware OS's SAML single sign-on session handling (samld) allows an attacker who has already obtained the ability to write files on the appliance to execute arbitrary code in the context of the samld service by causing samld to load a maliciously crafted session file.

Weakness: CWE-502

Which versions are affected by CVE-2026-13046?

It affects 1 product.

Products include Watchguard Fireware.

How do I fix CVE-2026-13046?

No fix has been published for CVE-2026-13046 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2026-13046 being exploited?

There is no known exploitation of CVE-2026-13046 in the wild and no public exploit code.

Other vulnerabilities in Watchguard Fireware

• CVE-2022-26318 WatchGuard Firebox and XTM Appliances Arbitrary Code Execution Exploited Critical 9.8
• CVE-2025-14733 WatchGuard Firebox Out of Bounds Write Exploited Critical 9.3
• CVE-2025-9242 WatchGuard Firebox Out-of-Bounds Write Exploited Critical 9.3
• CVE-2022-23176 WatchGuard Firebox and XTM Privilege Escalation Exploited High 8.8
• CVE-2022-31789 Integer overflow in n/a Critical 9.8

All Watchguard Fireware vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-4m89-w9gx-fh8p.