CVE-2026-48860
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk9th percentile — higher than 9% of all known CVEs
Summary
A vulnerability relying on IP Address for Authentication in the inet_tls_dist module of Erlang/OTP allows unauthenticated bypass of the LAN allowlist for TLS distribution. The inet_tls_dist:check_ip/1 function incorrectly uses inet:sockname/1, leading to always successful subnet mask comparisons.
Risk Assessment
The organization may be exposed to unauthorized access to the Erlang node, allowing remote RPC calls and binary code loading. Holders of CA-signed TLS certificates can gain full access to Erlang distribution.
Recommendation
It is recommended to upgrade to OTP versions 29.0.2 or later, 28.5.0.2, and 27.3.4.13 to mitigate this vulnerability. Additionally, consider implementing extra authentication mechanisms to secure node access.
Original NVD description (English source)
Reliance on IP Address for Authentication vulnerability in Erlang/OTP ssl (inet_tls_dist module) allows unauthenticated bypass of the distribution-over-TLS LAN allowlist. The inet_tls_dist:check_ip/1 function, which enforces a LAN allowlist for Erlang distribution over TLS, calls inet:sockname/1 instead of inet:peername/1 to obtain the peer's IP address. Because inet:sockname/1 returns the local socket address, both the local IP and the supposed peer IP resolve to the same value, causing the subnet mask comparison to always succeed regardless of the actual remote address. Any holder of a CA-signed TLS certificate can therefore bypass the LAN restriction and gain full Erlang distribution access to the node, including rpc:call/4 and code:load_binary/3. This vulnerability is associated with program file lib/ssl/src/inet_tls_dist.erl. This issue affects OTP from OTP 26.0 before 29.0.2, 28.5.0.2 and 27.3.4.13 corresponding to ssl from 11.0 before 11.7.2, 11.6.0.2 and 11.2.12.9.