---
id: CVE-2025-8003
title: >-
  Ashlar-Vellum Cobalt CO File Parsing Out-Of-Bounds Read Remote Code Execution
  Vulnerability
summary: >-
  Ashlar-Vellum Cobalt CO File Parsing Out-Of-Bounds Read Remote Code Execution
  Vulnerability. This vulnerability allows remote attackers to execute arbitrary
  code on affected installations of Ashlar-Vellum Cobalt. User interaction is
  requ…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-125
vendor: ashlar
product: cobalt
affected:
  - cobalt
published: '2025-09-17'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-8003'
references:
  - url: 'https://www.zerodayinitiative.com/advisories/ZDI-25-720/'
    label: zdi-disclosures@trendmicro.com
tags:
  - nvd
epss: 0.00205
epssPercentile: 0.09342
zeroDay: true
ingestedAt: '2026-09-26T00:22:39.944Z'
---

## Overview

Ashlar-Vellum Cobalt CO File Parsing Out-Of-Bounds Read Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of CO files. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-26235.

## Affected

- `cobalt`

## Remediation

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