Erlang OTP SSH Transport Flaws

A critical HTTP Request Smuggling vulnerability exists in Erlang OTP's inets httpd module that allows attackers to desynchronize front-end and back-end servers by exploiting inconsistent Content-Length header parsing. The vulnerability affects Erlang OTP versions from 17.0 through 28.4.0 (inets 5.10 through 9.6.0) and enables attackers to bypass security controls, potentially poisoning web caches or accessing unauthorized resources. While not currently listed in CISA KEV or showing high EPSS scores, the vulnerability has a CVSS 4.0 score of 7.0 and could lead to significant security boundary violations in production environments using affected Erlang-based web services.

A remote code execution vulnerability (CVSS 6.9) that allows denial of service. Remediation should follow standard vulnerability management procedures. Vendor patch is available.

The Erlang OTP ssh_sftpd module contains a path traversal vulnerability in the is_within_root/2 function that uses string prefix matching instead of proper path component validation to verify if accessed paths are within the configured root directory. An authenticated SFTP user can exploit this to access sibling directories sharing a common name prefix with the root directory (for example, if root is /home/user1, accessing /home/user10 or /home/user1_backup would succeed when it should fail). This vulnerability affects OTP versions 17.0 through 28.4.1 with corresponding SSH versions 3.0.1 through 5.5.1, with no confirmed active exploitation in the wild (KEV status not indicated as actively exploited) but with a moderate CVSS score of 5.3 reflecting the requirement for prior authentication.