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CVE-2026-27275 is a critical vulnerability affecting Adobe Substance 3D Stager versions 3.1.7 and earlier. It is an out-of-bounds write issue, a common memory corruption flaw where the software writes data beyond the allocated buffer’s boundaries. This specific vulnerability exists within the application’s parsing logic when handling maliciously crafted files. An attacker can exploit this by convincing a user to open a specially crafted file using the vulnerable software. When the file is opened, the application incorrectly calculates the memory bounds, allowing data to be written to adjacent memory locations. This uncontrolled write operation can corrupt memory, leading to a crash or, more severely, allowing the attacker to overwrite critical program data or code pointers. By carefully controlling the overwritten data, an attacker can achieve arbitrary code execution. This means they can run their own malicious code with the same permissions as the logged-in user, potentially leading to a full system compromise, data theft, or installation of malware. The vulnerability is triggered locally (AV:L) with low attack complexity (AC:L) and requires user interaction (UI:R), making it a high-risk threat for creative professionals who frequently handle untrusted files from external sources .
dailycve form:
Platform: Adobe
Version: 3.1.7 and earlier
Vulnerability : Out-of-bounds write
Severity: High (7.8)
date: 03/10/2026
Prediction: Patch released March 2026
What Undercode Say:
How Exploit:
The exploit hinges on a malicious .stg file or other supported asset format. The attacker crafts this file with specific data fields designed to trigger the miscalculation of buffer sizes when the Substance 3D Stager parser attempts to read it. This leads to a controlled out-of-bounds write. A successful exploit overwrites a function pointer or return address on the stack or heap, redirecting the program’s execution flow to shellcode injected by the attacker within the same file.
Example: Generating a pattern to find the exact offset for EIP/RIP control in a crash.
This is a common first step in exploit development for memory corruption bugs.
/usr/share/metasploit-framework/tools/exploit/pattern_create.rb -l 5000 > crash_file_part.stg
After the crash in a debugger like x64dbg or GDB, find the offset.
/usr/share/metasploit-framework/tools/exploit/pattern_offset.rb -q 0x69413169
[] Exact match at offset 1732
Example of a simple Python proof-of-concept structure to create a malformed file.
This would be expanded to include the specific trigger for the CVE.
def create_malicious_stager_file(output_file):
header = b"\x00" 1732 Padding up to return address
eip_overwrite = b"\xef\xbe\xad\xde" 0xdeadbeef placeholder for return address
shellcode = b"" Placeholder for actual payload (e.g., calc.exe shellcode)
footer = b"\x00" (1000 - len(shellcode))
with open(output_file, 'wb') as f:
f.write(header + eip_overwrite + shellcode + footer)
create_malicious_stager_file("malicious.stg")
Protection from this CVE:
The primary protection is to update to Adobe Substance 3D Stager version 3.1.8 or later, which contains the patch for this vulnerability. As a general best practice, users should avoid opening files from untrusted or unknown sources. Employing endpoint detection and response (EDR) solutions can help detect and block exploit attempts. Application sandboxing or running the software in a restricted environment can also limit the impact of a successful compromise. Keeping the operating system and all security software up-to-date adds additional layers of defense.
Example: Using a YARA rule to scan for potentially malicious files exploiting this class of bug.
This is a detection, not a prevention, method.
rule SUSPICIOUS_Substance3D_OutOfBounds_Write {
meta:
description = "Detects patterns in files that might attempt to exploit out-of-bounds write in Substance 3D Stager"
author = "Analyst"
reference = "CVE-2026-27275"
date = "2026-03-12"
strings:
// Look for unusually large size fields in the file header structure (simplified example)
$suspicious_size = { FF FF 00 00 } // Example of a maxed-out 16-bit integer that could cause overflow
$file_magic = { 53 54 47 52 } // "STGR" magic bytes for Stager files
condition:
$file_magic at 0 and $suspicious_size
}
Command to scan a directory with YARA
yara -r suspicious_substance3d_rule.yar /path/to/downloaded/files/
Impact:
Successful exploitation of CVE-2026-27275 allows an attacker to execute arbitrary code on the victim’s machine. Given the context of the current user, the attacker gains the same level of system access as the user running Substance 3D Stager. This could lead to the exfiltration of sensitive project files, intellectual property, or personal data. It could also serve as an initial foothold for deploying ransomware or other malware, or for moving laterally across a network to compromise other systems .
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Sources:
Reported By: nvd.nist.gov
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