Vulnerability in Librespark Libretv
CVE-2026-123207
LibreTV before v2.21.2 contains a server-side request forgery vulnerability that allows authenticated users to bypass checkUpstreamAllowed() by exploiting unpinned DNS resolution in fetchWithSafeRedirects(). Attackers controlling authoritative DNS can return public addresses during validation and internal addresses at connection time via /api/source/test, /api/proxy, /api/search or /api/detail to reach loopback services, private hosts or cloud metadata endpoints.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/LibreSpark/LibreTV/blob/29cbeb3d37b4876f909a0354087a3531af0447f6/src… (technical-description)
- github.com/LibreSpark/LibreTV/commit/cb4219368b7f6502387a703ef2a781ba763da2b1 (patch)
- github.com/LibreSpark/LibreTV/issues/941 (issue-tracking)
- github.com/LibreSpark/LibreTV/pull/960 (issue-tracking, patch)
- LibreTV v2.21.2 Release Notes (release-notes)
- VulnCheck Advisory: LibreTV before v2.21.2 SSRF Protection Bypass via DNS Rebinding (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123207?
- CVE-2026-123207 is a low-severity vulnerability in Librespark Libretv, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 3.1/10. Published 2026-11-05.
- How severe is CVE-2026-123207?
- Low severity. CVSS v3 base score is 3.1 out of 10.