---
id: CVE-2026-73523
title: >-
  COVESA Open1722 through 0.9.2 contains an integer truncation vulnerability in
  acf-can-listener.c that allows unauthenticated remote attackers to cause the
  CAN listener to transmit process stack memory onto the CAN bus by sending a
  reject…
summary: >-
  COVESA Open1722 through 0.9.2 contains an integer truncation vulnerability in
  acf-can-listener.c that allows unauthenticated remote attackers to cause the
  CAN listener to transmit process stack memory onto the CAN bus by sending a
  reject…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-197
published: '2026-08-17'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:06:30.133'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73523'
references:
  - url: 'https://github.com/COVESA/Open1722/issues/154'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/covesa-open1722-stack-memory-disclosure-via-acf-can-listener-c-integer-truncation
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00549
epssPercentile: 0.43613
ingestedAt: '2026-09-24T20:51:40.205Z'
---

## Overview

COVESA Open1722 through 0.9.2 contains an integer truncation vulnerability in acf-can-listener.c that allows unauthenticated remote attackers to cause the CAN listener to transmit process stack memory onto the CAN bus by sending a rejected UDP datagram with a matching AVTP stream ID. The num_can_msgs variable declared as uint8_t truncates the -1 error return value from avtp_to_can() to 255, causing a write loop to iterate 255 times over a 15-slot stack array and leak approximately 18 KB of adjacent stack memory as roughly 240 CAN frames to any recipient on the CAN bus.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.