High [CVE-2026-72552] Server-Side Request Forgery allows information disclosure and internal network scanning
This high-severity Red Hat Linux advisory covers CVE-2026-72552.
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Summary
A server-side request forgery vulnerability in Dub as of 2026-07-10 allows unauthenticated remote attackers to make the server issue HTTP requests to arbitrary internal or external hosts via the metatags edge endpoint. The endpoint fetches any caller-supplied URL without applying a denylist or requiring authentication.
An attacker can use this to scan internal services or exfiltrate data from cloud metadata endpoints. A flaw was found in Dub.
This can be exploited via the `metatags` edge endpoint, which processes caller-supplied URLs without proper validation or authentication. Successful exploitation could lead to information disclosure, such as scanning internal services or exfiltrating data from cloud metadata endpoints.
An unauthenticated remote attacker can supply arbitrary HTTP/HTTPS URLs to the endpoint, which fetches caller-provided addresses without enforcing IP denylists, domain egress controls, or authentication requirements.
Consequently, the server executes arbitrary outbound network requests on behalf of the attacker, enabling internal network port scanning and exposure of local metadata endpoints or internal web services, posing an Important impact to confidentiality. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
Weakness: CWE-918.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 3 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 3 hours ago·verify at source
Mitigation checklist
- Restrict outbound network connectivity from the application host to block requests targeting private IP ranges and cloud metadata endpoints (e.g., 169.254.169.254). Alternatively, block external traffic or enforce strict authentication for the `/api/metatags` edge endpoint at the reverse proxy or API gateway level.
Official advisory · high-confidence parse· fetched 3 hours ago·verify at source
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