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CVE-2026-54494— Koel: Full-read SSRF via podcast enclosure URL: isPublicHost() filter_var guard does not reject NAT64 (64:ff9b::/96) or 6to4 (2002::/16) IPv6-transition wrappers of internal IPv4

Quick assessment

Affected
koel koel
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.

Koel是德国Koel社区开源的一款个人音乐流媒体服务软件。 Koel 9.7.1之前版本存在服务端请求伪造漏洞，该漏洞源于App\Helpers\Network::isPublicHost()函数使用filter_var()时未正确过滤NAT64和6to4包装的私有IP地址，将其视为公共地址，经过身份验证的用户可通过在podcast RSS中放置恶意地址触发服务端请求伪造，导致请求内部服务或云元数据并将响应返回给用户。

CVSS 5.3 · Medium EPSS 0.27% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
koel koel < 9.7.1 affected
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I. Basic Information for CVE-2026-54494

Vulnerability Information
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Vulnerability Title
Koel: Full-read SSRF via podcast enclosure URL: isPublicHost() filter_var guard does not reject NAT64 (64:ff9b::/96) or 6to4 (2002::/16) IPv6-transition wrappers of internal IPv4
Source: CVE Program / CVE List V5
Vulnerability Description
Koel is a free, open-source music streaming solution. Prior to 9.7.1, App\Helpers\Network::isPublicHost() uses filter_var() with FILTER_FLAG_NO_PRIV_RANGE and FILTER_FLAG_NO_RES_RANGE, which treats NAT64 64:ff9b::/96 and 6to4 2002::/16 wrappers of private, loopback, or link-local IPv4 addresses as public. An authenticated user can place such an address in a podcast RSS <enclosure url> and reach app/Values/Podcast/EpisodePlayable.php through EpisodePlayable::createForEpisode(), where isSafeUrl() accepts the target and Http::sink($file)->get($url) fetches it. On a host with NAT64 or 6to4 routing, Koel can request internal services or cloud metadata and return the response body to the user. This issue is fixed in version 9.7.1
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Koel 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Koel是德国Koel社区开源的一款个人音乐流媒体服务软件。 Koel 9.7.1之前版本存在服务端请求伪造漏洞，该漏洞源于App\Helpers\Network::isPublicHost()函数使用filter_var()时未正确过滤NAT64和6to4包装的私有IP地址，将其视为公共地址，经过身份验证的用户可通过在podcast RSS中放置恶意地址触发服务端请求伪造，导致请求内部服务或云元数据并将响应返回给用户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
koel koel < 9.7.1 -

II. Public POCs for CVE-2026-54494

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III. Intelligence Information for CVE-2026-54494

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Patches & Fixes for CVE-2026-54494 (1)

Vendor Advisories for CVE-2026-54494 (1)

Other References for CVE-2026-54494 (1)

Same Patch Batch · koel · 2026-08-19 · 4 CVEs total

CVE-2026-54493 7.7 HIGH Koel: Authenticated Full-Read SSRF via Subsonic Internet Radio Stations
CVE-2026-54491 7.1 HIGH Koel: Incomplete fix for CVE-2026-47260 — systemic SSRF in podcast & radio fetch paths
CVE-2026-54492 4.3 MEDIUM Koel: Authenticated Blind SSRF via Subsonic Podcast Channel Creation

IV. Related Vulnerabilities

Same product: koel
Same vendor: koel
Same weakness: CWE-918

V. Comments for CVE-2026-54494

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