Vulnerability · Published Oct 8, 2026 · Assigned by mitre

CVE-2026-107449

Low 3.4

In plain English

A low-severity server-side request forgery in Heimdall from linuxserver. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 3.1)3.4Low

Exploit odds (30 days)0.2%top 94.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
linuxserver	Heimdall	0 – through 2.8.3

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

References

https://github.com/kashishtopi/heimdall-unauth-ssrf exploit, technical-description
https://github.com/linuxserver/Heimdall/blob/9ad5864a80d7025db1e6eab8eb2981c165b0ddff/app/SupportedApps.php product