# CVE-2026-121423: SurrealDB before 3.3.0 DoS via Unbounded Recursion in val::Value Serialization

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

SurrealDB before 3.3.0 contains an unbounded recursion vulnerability that allows authenticated users to abort the surreald process by triggering stack overflow on deeply nested values. Attackers can repeatedly run UPDATE statements wrapping a stored array in itself, then SELECT or EXPORT it, causing persistent denial of service for all tenants.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- surrealdb / surrealdb (surrealdb): ≥ 0; < 3.3.0 (affected, semver); 3.3.0 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7.1 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-674

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/surrealdb/surrealdb/security/advisories/GHSA-rpmq-gq3f-h6jg (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/surrealdb-before-3.3.0-dos-via-unbounded-recursion-in-val-value-serialization (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121423; retrieved 2026-11-03; source updated 2026-11-03

Revision: 9c9e9ec51ea71a3fa5b7bddca398d2489046bff74687e1e0a17cce7f19d744f3

Canonical: https://y2.dev/cve/CVE-2026-121423

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