Is CVE-2026-107449 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-107449?

CVE-2026-107449 has a CVSS v3 severity of LOW (3.4).

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CVE-2026-107449

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.