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CVE-2026-121753— Ashlar-Vellum Cobalt XE File Parsing Use-After-Free Remote Code Execution Vulnerability

Quick assessment

Affected
Ashlar-Vellum Cobalt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ashlar-Vellum Cobalt XE 文件解析中的释放后使用（Use-After-Free）远程代码执行漏洞。该漏洞允许远程攻击者在受影响的 Ashlar-Vellum Cobalt 安装中执行任意代码。利用此漏洞需要用户交互，即目标用户必须访问恶意网页或打开恶意文件。 具体缺陷存在于 XE 文件的解析过程中。该问题源于在执行对象操作前未验证对象是否仍然存在。攻击者可利用此漏洞，在当前进程的执行上下文中运行代码。此漏洞编号为 ZDI-CAN-28587。

AI Predicted 8.8 Difficulty: Moderate
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I. Basic Information for CVE-2026-121753

Vulnerability Information
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Vulnerability Title
Ashlar-Vellum Cobalt XE File Parsing Use-After-Free Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Ashlar-Vellum Cobalt XE File Parsing Use-After-Free 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 XE files. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28587.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Ashlar-Vellum Cobalt 1204.207 -

II. Public POCs for CVE-2026-121753

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III. Intelligence Information for CVE-2026-121753

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Other References for CVE-2026-121753 (1)

Same Patch Batch · Ashlar-Vellum · 2026-11-12 · 5 CVEs total

CVE-2026-121752 Ashlar-Vellum Cobalt LI File Parsing Heap-based Buffer Overflow Remote Code Execution Vuln
CVE-2026-121742 Ashlar-Vellum Cobalt XE File Parsing Use-After-Free Remote Code Execution Vulnerability
CVE-2026-121744 Ashlar-Vellum Cobalt XE File Parsing Stack-based Buffer Overflow Remote Code Execution Vul
CVE-2026-121743 Ashlar-Vellum Cobalt AR File Parsing Heap-based Buffer Overflow Remote Code Execution Vuln

IV. Related Vulnerabilities

Same product: Cobalt
Same vendor: Ashlar-Vellum
Same weakness: CWE-416