---
id: "CVE-2026-121508"
kind: "vulnerability"
aliases: ["CVE-2026-121508"]
title: "\u00b5D3TN: use-after-free in BPv6 fragmenter lets remote attackers crash the service"
severity: "medium"
cvss: 5.9
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["bpv6", "delay-tolerant-networking", "infrastructure", "udtn"]
not_affected_if: []
published_at: "2026-11-03T15:17:38+00:00"
first_seen_at: "2026-11-03T15:22:01+00:00"
updated_at: "2026-11-03T15:23:21+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121508", "first_seen_at": "2026-11-03T15:22:01+00:00"}]
---

# µD3TN: use-after-free in BPv6 fragmenter lets remote attackers crash the service

µD3TN is a Bundle Protocol delay-tolerant networking implementation; a use-after-free in its BPv6 fragmenter cleanup path is triggered when a memory allocation fails. A remote unauthenticated attacker can cause a denial of service.

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

## Timeline

- 2026-11-03T15:22:01+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121508

## From the sources

Use-After-Free in µD3TN BPv6 Fragmenter Cleanup allows Unauthenticated Remote Attacker to Cause DoS on Allocation Failure

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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_