Jellyfin through 12.4 SSRF via Gzip-Compressed Data URI in SVG Profile Images

Advisories

Jellyfin through 12.4 SSRF via Gzip-Compressed Data URI in SVG Profile Images

Severity: high
Date: 10/30/2026
Affecting: jellyfin <= 12.4
CVE: CVE-2026-119549
CWE: CWE-918 Server-Side Request Forgery (SSRF)
CVSS: 7.1
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
References: https://github.com/jellyfin/jellyfin/blob/v12.4/src/Jellyfin.Drawing.Skia/SvgSecurityValidator.cs#L169-L173
https://github.com/jellyfin/jellyfin/blob/v12.4/Jellyfin.Api/Controllers/ImageController.cs#L96
GitHub Security Advisory (GHSA-cf3c-8m59-2vhx)
https://abraxaslabs.tech/research/jellyfin-svg-gzip
https://github.com/jellyfin/jellyfin
Credit: Abraxas Labs
Description: Jellyfin through 12.4 contains a server-side request forgery vulnerability that lets authenticated users bypass SvgSecurityValidator by embedding gzip-compressed SVG in non-SVG image data URIs. Attackers can upload such profile images via POST /UserImage, then trigger unauthenticated rendering via GET /UserImage to fetch internal URLs, read local image files, or exhaust memory.

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