CVE-2026-19781— Ashlar-Vellum Cobalt VS 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 VS 文件解析堆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 安装实例上执行任意代码。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 VS 文件的解析过程中。该问题源于在将用户提供的数据复制到基于堆的缓冲区之前，未对其长度进行充分验证。攻击者可利用此漏洞在当前进程的上下文中执行代码。该漏洞的跟踪编号为 ZDI-CAN-28173。
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Ashlar-Vellum | Cobalt | 1204.204 |
affected |
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I. Basic Information for CVE-2026-19781
Vulnerability Information
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Vulnerability Title
Ashlar-Vellum Cobalt VS File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Ashlar-Vellum Cobalt VS 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 VS 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-28173.
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 | 1204.204 | - |
|
II. Public POCs for CVE-2026-19781
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-19781 (1)
-
🔗 ZDI-26-587 - TrendAI™ Zero Day Initiative™ (ZDI) x_research-advisory
IV. Related Vulnerabilities
Same product: Cobalt
-
CVE-2025-65088
Out-of-bounds read in Ashlar-Vellum Cobalt, Xenon, Argon, Li -
CVE-2025-65087
Out-of-bounds read in Ashlar-Vellum Cobalt, Xenon, Argon, Li -
CVE-2025-65086
Out-of-bounds write in Ashlar-Vellum Cobalt, Xenon, Argon, L -
CVE-2025-65085
Heap-based Buffer Overflow in Ashlar-Vellum Cobalt, Xenon, A -
CVE-2025-65084
Out-of-bounds Write in Ashlar-Vellum Cobalt, Xenon, Argon, L
Same vendor: Ashlar-Vellum
-
CVE-2025-65088
Out-of-bounds read in Ashlar-Vellum Cobalt, Xenon, Argon, Li -
CVE-2025-65087
Out-of-bounds read in Ashlar-Vellum Cobalt, Xenon, Argon, Li -
CVE-2025-65086
Out-of-bounds write in Ashlar-Vellum Cobalt, Xenon, Argon, L -
CVE-2025-65085
Heap-based Buffer Overflow in Ashlar-Vellum Cobalt, Xenon, A -
CVE-2025-65084
Out-of-bounds Write in Ashlar-Vellum Cobalt, Xenon, Argon, L
Same weakness: CWE-122
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V. Comments for CVE-2026-19781
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