User Interaction — CraftedSignal Threat Feed

CVE-2026-34682: Adobe Substance3D Designer Out-of-Bounds Write Vulnerability

hello@craftedsignal.io — Tue, 12 May 2026 19:18:19 +0000

Adobe Substance3D Designer versions 15.1.0 and earlier contain an out-of-bounds write vulnerability (CVE-2026-34682). Successful exploitation could allow an attacker to execute arbitrary code with the privileges of the current user. However, this vulnerability requires user interaction, as the victim must open a malicious file specifically crafted to trigger the out-of-bounds write. This vulnerability poses a risk to organizations where users routinely work with Substance3D Designer and may be tricked into opening untrusted files, potentially compromising their systems.

Attack Chain

The attacker crafts a malicious Substance3D Designer file.
The attacker delivers the malicious file to the victim via email, shared drive, or other means.
The victim, unaware of the threat, opens the malicious file using a vulnerable version of Substance3D Designer (<= 15.1.0).
Substance3D Designer attempts to parse the malicious file.
Due to the crafted structure of the file, an out-of-bounds write occurs within the application’s memory.
The out-of-bounds write corrupts memory, potentially overwriting critical data or code.
The attacker gains control of the application’s execution flow by overwriting function pointers or other control data.
The attacker executes arbitrary code within the context of the user, leading to system compromise.

Impact

Successful exploitation of CVE-2026-34682 can lead to arbitrary code execution, potentially allowing an attacker to install malware, steal sensitive data, or pivot to other systems on the network. The vulnerability requires user interaction, limiting the scope of potential attacks. However, if a user with elevated privileges is compromised, the impact could be significant, potentially affecting the entire organization.

Recommendation

Upgrade to a version of Substance3D Designer later than 15.1.0 to patch CVE-2026-34682.
Educate users about the dangers of opening files from untrusted sources to mitigate the user interaction requirement for exploitation.
Implement application control policies to restrict the execution of unauthorized or potentially malicious code.
Deploy the Sigma rule “Detect Suspicious File Opening in Substance3D Designer” to detect potential exploitation attempts based on process execution patterns.
Enable process creation logging to provide necessary data for the above Sigma rule.

CVE-2026-34681 - Adobe Substance3D Designer Out-of-Bounds Write Vulnerability

hello@craftedsignal.io — Tue, 12 May 2026 19:17:58 +0000

Adobe Substance3D Designer versions 15.1.0 and earlier contain an out-of-bounds write vulnerability (CVE-2026-34681). This vulnerability allows for arbitrary code execution in the context of the current user. The attack requires user interaction, as the victim must open a specially crafted malicious file. Successful exploitation could allow an attacker to execute arbitrary commands on the victim’s system. This vulnerability impacts systems where users routinely handle files from untrusted sources, such as downloaded assets or shared projects.

Attack Chain

Attacker crafts a malicious Substance3D Designer file.
Attacker distributes the malicious file to the victim via email, shared storage, or other means.
The victim, unaware of the danger, opens the malicious file in Adobe Substance3D Designer (version 15.1.0 or earlier).
The out-of-bounds write vulnerability is triggered during the parsing or processing of the malicious file.
The attacker gains control of the application’s execution flow due to the memory corruption.
The attacker injects and executes arbitrary code within the context of the current user.
The attacker can then perform actions such as installing malware, stealing sensitive data, or compromising other applications.

Impact

Successful exploitation of CVE-2026-34681 can result in arbitrary code execution on the victim’s system. An attacker could leverage this to install malware, steal sensitive information, or gain persistent access. The severity of the impact depends on the user’s privileges and the sensitivity of the data accessible to the user. This vulnerability could potentially affect any user of Substance3D Designer 15.1.0 and earlier, especially those who work with files from untrusted or unknown sources.

Recommendation

Upgrade to a version of Adobe Substance3D Designer that addresses CVE-2026-34681.
Exercise caution when opening files from untrusted sources.
Implement the Sigma rule “Detect Suspicious Substance3D File Opening” to detect potential exploitation attempts based on process execution characteristics.
Monitor process creation events for Substance3D_Designer.exe spawning child processes with unusual command-line arguments.

CVE-2026-34644: Adobe After Effects Integer Overflow Vulnerability

hello@craftedsignal.io — Tue, 12 May 2026 18:27:29 +0000

Adobe After Effects versions 26.0, 25.6.4, and earlier are susceptible to an integer overflow or wraparound vulnerability, as detailed in CVE-2026-34644. This vulnerability could allow an attacker to execute arbitrary code within the context of the current user. Successful exploitation requires user interaction, specifically the opening of a specially crafted, malicious file within After Effects. This vulnerability poses a significant risk to users who regularly handle project files from untrusted sources, as successful exploitation could lead to system compromise.

Attack Chain

Attacker crafts a malicious Adobe After Effects project file (.aep or similar) designed to trigger an integer overflow during processing.
The attacker distributes the malicious file to the victim, potentially through phishing, social engineering, or other means.
The victim, unaware of the threat, opens the malicious file using a vulnerable version of Adobe After Effects (<= 26.0, 25.6.4).
During file parsing, the integer overflow occurs, leading to memory corruption.
The memory corruption allows the attacker to overwrite critical data structures within the After Effects process.
The attacker leverages the corrupted memory to inject and execute arbitrary code.
The attacker’s code executes within the context of the current user, granting them the same privileges.
The attacker can then perform malicious actions such as installing malware, stealing data, or gaining persistent access to the system.

Impact

Successful exploitation of CVE-2026-34644 allows for arbitrary code execution within the context of the user running After Effects. The vulnerability requires user interaction, limiting the scale of potential attacks. However, if successful, attackers can gain complete control over the user’s system, potentially leading to data theft, malware installation, or further network compromise. Targeted attacks against individuals in creative fields could result in significant financial and reputational damage.

Recommendation

Upgrade Adobe After Effects to a version beyond 26.0 or 25.6.4 to patch CVE-2026-34644 as recommended by Adobe.
Educate users about the risks of opening files from untrusted sources to mitigate the user interaction component.
Deploy the Sigma rule “Detect Suspicious After Effects File Opening” to identify potential exploitation attempts by monitoring process creations related to After Effects opening unusual files.
Consider using application control solutions to restrict the execution of unauthorized code within the After Effects process to limit the impact of successful exploitation.