Quick answers
- Is CVE-2026-121423 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-121423 being exploited in the wild.
- How severe is CVE-2026-121423?
- Medium severity, with a CVSS score of 6.5, published 3 November 2026.
- Which products and versions are affected?
- Surrealdb before 3.3.0.
- Is there a fix for CVE-2026-121423?
- Yes: fixed in 3.3.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-121423 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-121423?
- Check whether you run Surrealdb at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 3.3.0
Technical details
An unbounded recursion vulnerability exists in three code paths that walk val::Value objects (response serializer, SQL formatter, and storage codec) with no cumulative depth guard. An authenticated user with table write+read privileges can incrementally accumulate depth across multiple shallow UPDATE requests, then trigger stack overflow by reading or exporting the deeply nested value. Because SurrealDB is compiled with panic='abort', the stack overflow unconditionally terminates the surreald process, causing persistent denial of service for all tenants.
Affected products
- SurrealDB SurrealDB before 3.3.0
Timeline
- 2026-10-19: disclosed
- 2026-11-03: advisory