CVE-2026-107449 Server-side request forgery in Heimdall
Unauthenticated attackers can exploit SSRF in Heimdall to access internal network resources and metadata services via unprotected endpoints.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-107449?
CVE-2026-107449 is a low-severity server-side request forgery vulnerability in linuxserver Heimdall, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
linuxserver Heimdall through 2.8.3 applies its SafeUrlFetcher SSRF protection mechanism only to ItemController; the enhanced-application test and live-stats requests occur via SupportedApps::execute(), a GuzzleHttp client that lacks IP address restrictions. In some realistic installations, the POST /test_config (and GET /get_stats) endpoints are accessible through CSRF, and thus an unauthenticated attacker can force the server to send requests to arbitrary internal hosts and ports (including 169.254.169.254) and read a status/port oracle in addition to partial response data.
Weakness: CWE-918
Which versions are affected by CVE-2026-107449?
How do I fix CVE-2026-107449?
No fix has been published for CVE-2026-107449 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-2026-107449 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107449 exists.
Sources
Also known as GHSA-hrj5-rw8j-34qj.