CVE-2026-119549— Jellyfin through 12.4 SSRF via Gzip-Compressed Data URI in SVG Profile Images

Quick assessment

Affected

jellyfin jellyfin

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Jellyfin 12.4 及更早版本存在一个服务器端请求伪造（SSRF）漏洞。该漏洞允许已认证用户通过将 gzip 压缩的 SVG 嵌入非 SVG 格式的图像数据 URI，从而绕过 SvgSecurityValidator 验证机制。攻击者可通过 POST /UserImage 接口上传此类个人资料图片，随后利用 GET /UserImage 接口触发未认证的渲染操作，进而访问内部 URL、读取本地图像文件或耗尽服务器内存。

CVSS 7.1 · High Updated Oct 30, 2026

Possible ATT&CK Techniques 2 AI

T1086 T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

服务端请求伪造(SSRF)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
jellyfin	jellyfin	0 ~ 12.4	-

II. Public POCs for CVE-2026-119549

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-119549

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Other References for CVE-2026-119549 (5)

https://abraxaslabs.tech/research/jellyfin-svg-gzip third-party-advisory
jellyfin/src/Jellyfin.Drawing.Skia/SvgSecurityValidator.cs at v12.4 · jellyfin/jellyfin · GitHub technical-description
GitHub - jellyfin/jellyfin: The Free Software Media System - Server Backend & API · GitHub product
Memory exhaustion and SSRF via external references in user-supplied SVG images · Advisory · jellyfin/jellyfin · GitHub related vendor-advisory
🔗 Jellyfin through 12.4 SSRF via Gzip-Compressed Data URI in SVG Profile Images | Advisories | VulnCheck third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-119549

Same Patch Batch · jellyfin · 2026-10-30 · 3 CVEs total

CVE-2026-119551	6.5 MEDIUM	Jellyfin through 12.4 Authorization Bypass via GET /Items/Suggestions
CVE-2026-119550	3.5 LOW	Jellyfin through 12.4 Information Disclosure via GET /Playlists/{playlistId}

IV. Related Vulnerabilities

Same product: jellyfin

Same vendor: jellyfin

Same weakness: CWE-918