Vulnerability · Published Aug 7, 2026 · Assigned by NCSC.ch
CVE-2026-54212TeamDavid: Buffer Overflow in JSON-parsing
Critical 9.5
In plain English
A critical-severity out-of-bounds write in TeamDavid from Tobit Laboratories AG. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).
Official description
Tobit Laboratories AG TeamDavid's Webbox application implements an API endpoint that is vulnerable to a buffer overflow condition. By submitting a specially crafted JSON body, such as one that is at least 8 characters long and begins with a number, an unauthenticated attacker can cause the server to crash, resulting in denial of service. Depending on the stack state or if a stack canary can be disclosed through another vulnerability, this buffer overflow could potentially lead to remote code execution and full compromise of the server. This issue affects TeamDavid before Rollout 528. Starting with Rollout 528 (June 30, 2026), the affected functionality is disabled by default and the vulnerabilities are therefore no longer exposed through this functionality.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Tobit Laboratories AG | TeamDavid | 0 – before Rollout 528 |
Weakness: CWE-787 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
References
- https://chayns.net/77892-10814/tapp/763210?postId=11454 release-notes
- https://labs.infoguard.ch/posts/22-cves-in-david-a-secure-m365-alternative/ third-party-advisory