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
EPSS: 0.002 (15.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
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)
- github.com/LibreSpark/LibreTV/releases/tag/v2.21.2 (release-notes)
- www.vulncheck.com/advisories/libretv-before-2.21.2-ssrf-protection-bypass-via-d… (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.