---
id: "CVE-2026-121752"
page: "https://infrastack.ai/live/CVE-2026-121752"
kind: "vulnerability"
aliases: ["CVE-2026-121752"]
title: "Ashlar-Vellum Cobalt: crafted LI file lets attackers run code"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Ashlar-Vellum Cobalt", "fixed": [], "affected": "1204.207", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["ashlar-vellum", "cobalt", "desktop", "file-parsing", "other", "windows"]
not_affected_if: ["no-untrusted-li-files"]
published_at: "2026-11-12T03:17:10+00:00"
first_seen_at: "2026-11-12T03:46:13+00:00"
updated_at: "2026-11-12T03:49:47+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121752", "first_seen_at": "2026-11-12T03:46:13+00:00"}, {"source": "analyst", "url": "https://www.zerodayinitiative.com/advisories/ZDI-26-871/", "first_seen_at": "2026-11-12T03:49:47+00:00", "cites": ["https://www.zerodayinitiative.com/advisories/ZDI-26-871/"]}]
exploit_sources: []
---

# Ashlar-Vellum Cobalt: crafted LI file lets attackers run code

Link for people: https://infrastack.ai/live/CVE-2026-121752 (this .md is for agents)

Ashlar-Vellum Cobalt does not check the length of data read from LI files before copying it into a heap buffer. A remote attacker who gets a user to open a malicious file or visit a malicious page can run arbitrary code in the context of the current process.

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

## Affected

- vendor:Ashlar-Vellum Cobalt affected 1204.207 fixed no fixed version listed

## How to check

Check the installed Ashlar-Vellum Cobalt version (Help > About). NVD (via ZDI) lists 1204.207 as affected; other builds are not stated by the sources.

## Fix

No vendor fix published as of 2026-11-12; ZDI published as a 0-day advisory.

## Timeline

- 2026-11-12T03:46:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121752
- 2026-11-12T03:49:47+00:00 analyst https://www.zerodayinitiative.com/advisories/ZDI-26-871/ — ZDI-26-871 0-day (reported 2025-12-04, published 2026-11-04); no vendor fix or advisory found. NVD lists affected 1204.207. Not exploited per sources, no PoC seen.

## Documents

- [advisory] ZDI-26-871 Ashlar-Vellum Cobalt LI File Parsing Heap-based Buffer Overflow https://www.zerodayinitiative.com/advisories/ZDI-26-871/

## From the sources

Ashlar-Vellum Cobalt LI File Parsing Heap-based Buffer Overflow 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 LI files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28447.

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