CVE-2026-74858 jae-jae fetcher-mcp URL Validation security-credentials fetch_urls server-side request forgery
A server-side request forgery vulnerability in the fetcher-mcp library allows attackers to access internal metadata endpoints, potentially exposing sensitive credentials.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-74858?
CVE-2026-74858 is a medium-severity server-side request forgery vulnerability in jae-jae fetcher-mcp, published on 17 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability has been found in jae-jae fetcher-mcp up to 0.3.9. Impacted is the function fetch_url/fetch_urls of the file /latest/meta-data/iam/security-credentials/ of the component URL Validation. Such manipulation leads to server-side request forgery. It is possible to launch the attack remotely. The project was informed of the problem early through an issue report but has not responded yet.
Weakness: CWE-918
Which versions are affected by CVE-2026-74858?
How do I fix CVE-2026-74858?
No fix has been published for CVE-2026-74858 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-74858 being exploited?
There is no known exploitation of CVE-2026-74858 in the wild and no public exploit code.
Sources
Also known as GHSA-c33j-cj33-6649.