---
id: CVE-2026-48860
title: >-
  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 allow…
summary: >-
  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 allow…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-863
  - CWE-1025
vendor: erlang
product: erlang/otp
affected:
  - 'erlang/otp >= 26.0, < 27.3.4.13'
  - 'erlang/otp >= 28.0, < 28.5.0.2'
  - 'erlang/otp >= 29.0, < 29.0.2'
  - 'erlang/ssl >= 11.0, < 11.2.12.9'
  - 'erlang/ssl >= 11.6, < 11.6.0.2'
  - 'erlang/ssl >= 11.7, < 11.7.2'
patched:
  - erlang/otp 29.0.2
  - erlang/ssl 11.7.2
published: '2026-06-10'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:17:14.607'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48860'
references:
  - url: 'https://cna.erlef.org/cves/CVE-2026-48860.html'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/erlang/otp/commit/0209a6df65d605552b378273027b3968b35f26b4
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/erlang/otp/commit/7a08c5507862a7011568506d0c17b1fdef30bee4
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://github.com/erlang/otp/security/advisories/GHSA-gp7x-mfv6-52cv'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://osv.dev/vulnerability/EEF-CVE-2026-48860'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://www.erlang.org/doc/system/versions.html#order-of-versions'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-06-10T16:23:08.922807Z'
scores:
  nvd: 6.5
  cna: 7.5
epss: 0.00347
epssPercentile: 0.25479
ingestedAt: '2026-09-24T20:51:40.269Z'
---

## Overview

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.

## Affected

- `erlang/otp >= 26.0, < 27.3.4.13`
- `erlang/otp >= 28.0, < 28.5.0.2`
- `erlang/otp >= 29.0, < 29.0.2`
- `erlang/ssl >= 11.0, < 11.2.12.9`
- `erlang/ssl >= 11.6, < 11.6.0.2`
- `erlang/ssl >= 11.7, < 11.7.2`

## Remediation

Upgrade past the affected range:

- `erlang/otp 29.0.2`
- `erlang/ssl 11.7.2`