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Advisory record · GHSA-rjg7-r26h-cfp2

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

CVSS 5.3 MediumEPSS 0.0043 · 37th percentile

Published by the GitHub Advisory Database at 15 Jul 2026, 18:21 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
phanan/koelPackagist<9.7.19.7.1
Identifiers
GHSA-rjg7-r26h-cfp2 · CVE-2026-54494 · PKSA-nwpt-px6q-b5bv
Weakness (CWE)
CWE-918
Tags
Published
15 Jul 2026
Updated
15 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

phanan/koel before 9.7.1 fails to block private IPv4 addresses wrapped in NAT64 or 6to4 IPv6 forms when fetching podcast episode URLs. An authenticated user who subscribes to a feed they control can read responses from internal services, including cloud metadata, on hosts with NAT64 or 6to4 routing. Upgrade to 9.7.1 or later.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 4.0 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0043, the 37th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:25 UTC First seen by agentprime
  2. 31 Oct 2026, 14:25 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.