---
id: "CVE-2026-104591"
kind: "vulnerability"
aliases: ["CVE-2026-104591"]
title: "libosmocore: buffer overflow in IuUP payload CRC lets remote attackers crash services"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["cellular", "infrastructure", "libosmocore", "osmocom", "telecom"]
not_affected_if: ["no-libosmocore"]
published_at: "2026-10-26T19:16:28+00:00"
first_seen_at: "2026-10-26T19:32:05+00:00"
updated_at: "2026-10-26T19:34:06+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104591", "first_seen_at": "2026-10-26T19:32:05+00:00"}]
---

# libosmocore: buffer overflow in IuUP payload CRC lets remote attackers crash services

libosmocore through 1.14.1 has a buffer overflow in osmo_iuup_compute_payload_crc() in src/gsm/iuup.c. The sources say a remote attacker can cause a denial of service.

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

## How to check

- Check the installed libosmocore version with `pkg-config --modversion libosmocore` (unknown if the sources list a fixed version)
- Look for `osmo_iuup_compute_payload_crc` in the library or in software linked against it (unknown if the sources name a tool)

## Fix

- Upgrade libosmocore past `1.14.1` once a fixed release is published (unknown: the sources do not name a fixed version)

## Timeline

- 2026-10-26T19:32:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-104591

## From the sources

libosmocore through 1.14.1 contains a buffer overflow in osmo_iuup_compute_payload_crc() in src/gsm/iuup.c. This allows a remote attacker to cause a denial of service.

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