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CVE-2026-121743— Ashlar-Vellum Cobalt AR File Parsing Heap-based Buffer Overflow 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 AR 文件解析过程中存在基于堆的缓冲区溢出远程代码执行漏洞。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。该缺陷具体存在于 AR 文件的解析逻辑中，原因是系统未对用户提供的数据长度进行充分验证，便将其复制到基于堆的缓冲区中。攻击者可利用此漏洞在当前进程的执行上下文中运行恶意代码。该漏洞编号为 ZDI-CAN-28675。

AI Predicted 8.8 Difficulty: Moderate Updated Nov 12, 2026

Possible ATT&CK Techniques 2 AI

T1190 · Exploit Public-Facing Application T1203 · Exploitation for Client Execution

Updated Nov 12, 2026

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Vulnerability Information

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Vulnerability Title

Ashlar-Vellum Cobalt AR File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability

Source: CVE Program / CVE List V5

Vulnerability Description

Ashlar-Vellum Cobalt AR 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 AR 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-28675.

Source: CVE Program / CVE List V5

CVSS Information

N/A

Source: CVE Program / CVE List V5

Vulnerability Type

堆缓冲区溢出

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Ashlar-Vellum	Cobalt	1204.209	-

II. Public POCs for CVE-2026-121743

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-121743

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Other References for CVE-2026-121743 (1)

https://www.zerodayinitiative.com/advisories/ZDI-26-873/ x_research-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121743

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

IV. Related Vulnerabilities

Same product: Cobalt

Same vendor: Ashlar-Vellum

Same weakness: CWE-122