Vulnerability · Published Jul 10, 2026 · Assigned by GitHub_M

CVE-2026-566769router: Image prefetch DNS rebinding allows SSRF to internal services

High 7.4

In plain English

A high-severity server-side request forgery in 9router from decolua. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.4High

Exploit odds (30 days)0.2%top 91.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

9Router is an AI router & token saver. Prior to 0.5.2, 9router validates image URLs by resolving the host before fetching, but open-sse/translator/concerns/image.js performs the later server-side image fetch with a separate DNS resolution. An authenticated attacker with access to the LLM proxy can use a vision-capable model and an attacker-controlled DNS name that first resolves to a public IP and then rebinds to an internal address, allowing server-side requests to internal-only HTTP services. This issue is fixed in version 0.5.2.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	9router	0.5.2	GHSA-cmhj-wh2f-9cgx

Affected products (as reported)

Vendor	Product	Versions
decolua	9router	< 0.5.2

Weakness: CWE-367, CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

References

https://github.com/decolua/9router/security/advisories/GHSA-cmhj-wh2f-9cgx x_refsource_CONFIRM
https://github.com/decolua/9router/commit/c7d07448c58bec1200741de0b73305b860416b82 x_refsource_MISC
https://github.com/decolua/9router/releases/tag/v0.5.2 x_refsource_MISC