# CVE-2026-48860: Erlang OTP auth bypass in inet_tls_dist LAN allowlist

Source: https://junglewise.ai/threats/cve-2026-48860-erlang-otp-auth-bypass-in-inet-tls-dist-lan-allowlist  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-10. Updated: 2026-06-10  
License: CC BY 4.0 with a link back

CVE-2026-48860 · Severity: info · CVSS 7.5 · Published 2026-06-10

Erlang/OTP is a programming platform used to build highly scalable and distributed systems. A flaw in its secure communication module allows unauthorized users to bypass network restrictions intended to limit access to the local network. If an attacker possesses a valid security certificate from the same provider, they can gain full control over the system, potentially leading to data theft or service disruption.

Vendors: [Erlang/OTP](https://junglewise.ai/threats/vendors/erlang-otp).

## Quick answers

**Is CVE-2026-48860 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-48860 being exploited in the wild.

**How severe is CVE-2026-48860?** Informational severity, with a CVSS score of 7.5, published 10 June 2026.

**Which products and versions are affected?** Erlang/OTP OTP ssl 26.0 to 27.3.4.12, 28.0 to 28.5.0.1, 29.0 to 29.0.1.

**Is there a fix for CVE-2026-48860?** A patch was published on 2026-06-10. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-48860 attacked?** It is attacked from the adjacent network, in a software library.

**Am I affected by CVE-2026-48860?** Check whether you run Erlang/OTP OTP ssl at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A logic error in the inet_tls_dist:check_ip/1 function causes a failure in LAN allowlist enforcement for Erlang distribution over TLS. The function incorrectly calls inet:sockname/1 (local address) instead of inet:peername/1 (remote address) to identify the connecting peer. Consequently, the subnet mask comparison compares the local IP against itself, always succeeding regardless of the actual remote IP. An attacker with a valid CA-signed TLS certificate can bypass the LAN restriction to gain full Erlang distribution access, enabling remote code execution via rpc:call/4. This affects OTP 26.0 through versions prior to 29.0.2, 28.5.0.2, and 27.3.4.13.

## Affected products

- Erlang OTP/ssl 26.0 to 27.3.4.12, 28.0 to 28.5.0.1, 29.0 to 29.0.1

## Timeline

- 2026-06-10: disclosed
- 2026-06-10: advisory
- 2026-06-10: patched

## References

- [https://cna.erlef.org/cves/CVE-2026-48860.html](https://cna.erlef.org/cves/CVE-2026-48860.html)
- [https://github.com/erlang/otp/commit/0209a6df65d605552b378273027b3968b35f26b4](https://github.com/erlang/otp/commit/0209a6df65d605552b378273027b3968b35f26b4)
- [https://github.com/erlang/otp/security/advisories/GHSA-gp7x-mfv6-52cv](https://github.com/erlang/otp/security/advisories/GHSA-gp7x-mfv6-52cv)
- [https://www.erlang.org/doc/system/versions.html](https://www.erlang.org/doc/system/versions.html)