---
id: "CVE-2026-116544"
kind: "vulnerability"
aliases: ["CVE-2026-116544"]
title: "Open5GS: crafted SUCI triggers heap over-read in 5G core"
severity: "medium"
cvss: 6.3
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["5g-core", "infrastructure", "open5gs", "self-hosted", "telecom"]
not_affected_if: ["versions-outside-2.6.1-2.8.0"]
published_at: "2026-10-26T16:17:20+00:00"
first_seen_at: "2026-10-26T16:31:01+00:00"
updated_at: "2026-10-26T16:33:00+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116544", "first_seen_at": "2026-10-26T16:31:01+00:00"}]
---

# Open5GS: crafted SUCI triggers heap over-read in 5G core

Open5GS 2.6.1 through 2.8.0 has an out-of-bounds read in parse_scheme_output() during SUCI de-concealment, where length checks are incomplete. A remote unauthenticated UE or SBI peer can send a crafted 42-byte scheme output to a UDM and read past a heap buffer.

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

## How to check

- Check the installed Open5GS version with `open5gs-udmd --version` or the package manager, and see whether it falls in `2.6.1` through `2.8.0`
- unknown whether the sources list a config setting that enables the vulnerable path

## Fix

- Upgrade Open5GS to a release later than `2.8.0`
- unknown: the sources do not name the fixed version

## Timeline

- 2026-10-26T16:31:01+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116544

## From the sources

Open5GS 2.6.1 through 2.8.0 contains an out-of-bounds read vulnerability in parse_scheme_output() in lib/sbi/conv.c during SUCI de-concealment due to incomplete length validation. Remote unauthenticated UEs or SBI peers can submit a crafted SUCI with a 42-byte scheme output to a UDM, triggering a heap over-read past the buffer.

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