CVE-2026-121421— SurrealDB 3.1.0 before 3.3.0 SSRF via Port-Specific --deny-net Host Aliasing Bypass

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 3.1.0 至 3.3.0 之前的版本存在服务器端请求伪造（SSRF）漏洞。该漏洞源于网络能力匹配机制的缺陷：针对特定端口的规则（格式为或）仅对字面主机字符串进行匹配，而解析后的 IP 检查过程会丢弃端口信息。因此，已认证用户可以调用函数，通过解析到被禁止 IP 地址的主机名，或直接使用被禁止主机名对应的 IP 地址，从而绕过限制并访问被封锁的内部服务。

CVSS 4.3 · Medium Updated Nov 03, 2026

Possible ATT&CK Techniques 2 AI

T1046 · Network Service Discovery T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

SurrealDB 3.1.0 before 3.3.0 SSRF via Port-Specific --deny-net Host Aliasing Bypass

Source: CVE Program / CVE List V5

Vulnerability Description

SurrealDB 3.1.0 before 3.3.0 contains a server-side request forgery vulnerability in network-capability matching because port-specific --deny-net rules (HOST:PORT or IP:PORT) match only a literal host string, while the resolved-IP check discards the port. Authenticated users can call http::* functions with a hostname resolving to a denied IP, or the IP of a denied hostname, to reach blocked internal services.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/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	3.1.0 ~ 3.3.0	-

II. Public POCs for CVE-2026-121421

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-121421

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Other References for CVE-2026-121421 (3)

https://www.cve.org/CVERecord?id=CVE-2026-121421

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-2026-121422	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-918