Unintended Proxy or Intermediary ('Confused Deputy') Affecting coturn/coturn package, versions [,4.9.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-COTURNCOTURN-15364892
- published28 Feb 2026
- disclosed25 Feb 2026
- credittr1xster-sec
Introduced: 25 Feb 2026
CVE-2026-27624 (opens in a new tab)How to fix?
Upgrade coturn/coturn to version 4.9.0 or higher.
Overview
Affected versions of this package are vulnerable to Unintended Proxy or Intermediary ('Confused Deputy') in the processing of access control lists for peer IP addresses due to improper handling of IPv4-mapped IPv6 addresses in the ioa_addr_is_loopback, ioa_addr_is_zero, and addr_less_eq functions. An attacker can bypass IP-based access restrictions by submitting requests with specially crafted IPv4-mapped IPv6 addresses.