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

Quick assessment

Affected

surrealdb surrealdb

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

3.3.0 之前的 SurrealDB 版本存在一个无界递归漏洞，允许已认证用户通过触发深层嵌套值的栈溢出，从而终止进程。攻击者可以反复执行 UPDATE 语句，将已存储的数组嵌套包裹在自身中，随后对其进行 SELECT 或 EXPORT 操作，导致所有租户遭受持续性的拒绝服务攻击。

CVSS 6.5 · Medium Updated Nov 03, 2026

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

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Vulnerability Information

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Vulnerability Title

SurrealDB before 3.3.0 DoS via Unbounded Recursion in val::Value Serialization

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

未经控制的递归

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
surrealdb	surrealdb	0 ~ 3.3.0	-

II. Public POCs for CVE-2026-121423

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-121423

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Other References for CVE-2026-121423 (2)

https://github.com/surrealdb/surrealdb/security/advisories/GHSA-rpmq-gq3f-h6jg vendor-advisory
https://www.vulncheck.com/advisories/surrealdb-before-3.3.0-dos-via-unbounded-recursion-in-val-value-serialization third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121423

Same Patch Batch · surrealdb · 2026-11-03 · 8 CVEs total

CVE-2026-121419	8.1 HIGH	SurrealDB 3.1.0 before 3.3.0 MCP Session Hijack via BoundSubject Collision
CVE-2026-121417	7.8 HIGH	SurrealDB before 3.3.0 Use-After-Free via affinitypool spawn_local in KV Backends
CVE-2026-121416	7.1 HIGH	SurrealDB 2.0.0 before 3.3.1 deny-funcs Capability Bypass via Method-Style Invocations
CVE-2026-121418	4.3 MEDIUM	SurrealDB 3.1.0 before 3.3.0 Incorrect Authorization via Streaming Index Planner
CVE-2026-121421	4.3 MEDIUM	SurrealDB 3.1.0 before 3.3.0 SSRF via Port-Specific --deny-net Host Aliasing Bypass
CVE-2026-121422	4.1 MEDIUM	SurrealDB from 3.1.0 before 3.3.0 SSRF via JWKS Implicit Default Port Bypass
CVE-2026-121420	3.3 LOW	SurrealDB 3.2.0 before 3.3.0 SSRF Guard Bypass via IPv6 Transition Addresses

IV. Related Vulnerabilities

Same product: surrealdb

Same vendor: surrealdb

Same weakness: CWE-674