---
id: "CVE-2026-116543"
kind: "vulnerability"
aliases: ["CVE-2026-116543"]
title: "Open5GS: empty multipart boundary lets unauthenticated requests corrupt memory and crash"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["5g-core", "infrastructure", "open5gs", "self-hosted", "telecom"]
not_affected_if: ["sbi-not-reachable", "version-outside-range"]
published_at: "2026-10-26T16:17:19+00:00"
first_seen_at: "2026-10-26T16:31:01+00:00"
updated_at: "2026-10-26T16:32:43+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116543", "first_seen_at": "2026-10-26T16:31:01+00:00"}]
---

# Open5GS: empty multipart boundary lets unauthenticated requests corrupt memory and crash

Open5GS 1.3.0 through 2.8.0 has a heap out-of-bounds write in parse_multipart() triggered by an empty multipart boundary. An unauthenticated attacker can send one crafted multipart/related request to the SBI interface of a network function, corrupting memory and crashing it.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Open5GS version against `1.3.0` through `2.8.0`
- Look for SBI interface exposure: unknown

## Fix

- Move to a release newer than `2.8.0`, version number unknown from sources
- Restrict access to the SBI interface to trusted network functions: unknown

## Timeline

- 2026-10-26T16:31:01+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116543

## From the sources

Open5GS 1.3.0 through 2.8.0 contains a heap out-of-bounds write vulnerability in parse_multipart() that allows unauthenticated attackers to corrupt memory by supplying an empty multipart boundary. Attackers can send a single crafted multipart/related request to the SBI interface of any network function, overflowing the lookbehind buffer and crashing it.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_