Riskcovery

CVE-2026-48860

Distribution-over-TLS LAN allowlist silently bypassed due to sockname/peername confusion in inet_tls_dist

State
Published
Severity
7.5 High
Published
Jun 10, 2026
Updated
Sep 24, 2026
Reserved
May 25, 2026

Read the record on cve.org

Description

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 OTP 27.3.4.13, OTP 28.5.0.2, and OTP 29.0.2, corresponding to ssl from 11.0 before 11.2.12.9, 11.6.0.2, and 11.7.2.

Scores

CVSSScoreVectorSource
4.07.5 HighCVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NEEF

Weaknesses

Affected Products

ProductVersions
OTPErlang
  • 26.0 and laterAffectedfrom 27.3.4.13Not affectedfrom 28.5.0.2Not affectedfrom 29.0.2Not affected
OTPErlang
  • 11.0 and laterAffectedfrom 11.2.12.9Not affectedfrom 11.6.0.2Not affectedfrom 11.7.2Not affected
OTPErlang
  • 7a08c5507862a7011568506d0c17b1fdef30bee4 to before 0209a6df65d605552b378273027b3968b35f26b4Affected

References

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