CVE-2026-121420— SurrealDB 3.2.0 before 3.3.0 SSRF Guard Bypass via IPv6 Transition Addresses

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.

SurrealDB 3.2.0 至 3.3.0（不含 3.3.0）版本在的检查中存在服务端请求伪造（SSRF）漏洞。该检查无法正确解析 NAT64、6to4 和 Teredo 类型的 IPv6 地址。已认证用户可通过 SurrealQL 的函数触发出站 HTTP 请求，利用嵌入了私有 IPv4 目标地址的过渡地址，从而访问 localhost、内部服务或云元数据端点。

CVSS 3.3 · Low Updated Nov 03, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

SurrealDB 3.2.0 before 3.3.0 SSRF Guard Bypass via IPv6 Transition Addresses

Source: CVE Program / CVE List V5

Vulnerability Description

SurrealDB from 3.2.0 before 3.3.0 contains a server-side request forgery vulnerability in the FilteringResolver is_private_ip check that fails to unwrap NAT64, 6to4, and Teredo IPv6 addresses. Authenticated users triggering outbound HTTP requests via SurrealQL http functions can use transition addresses embedding private IPv4 targets to reach localhost, internal services, or cloud metadata endpoints.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

服务端请求伪造(SSRF)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
surrealdb	surrealdb	3.2.0 ~ 3.3.0	-

II. Public POCs for CVE-2026-121420

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-121420

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Other References for CVE-2026-121420 (2)

https://github.com/surrealdb/surrealdb/security/advisories/GHSA-c9wc-jcr5-8974 vendor-advisory
https://www.vulncheck.com/advisories/surrealdb-3.2.0-before-3.3.0-ssrf-guard-bypass-via-ipv6-transition-addresses third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121420

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-2026-121423	6.5 MEDIUM	SurrealDB before 3.3.0 DoS via Unbounded Recursion in val::Value Serialization
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

IV. Related Vulnerabilities

Same product: surrealdb

Same vendor: surrealdb

Same weakness: CWE-918