CVE-2026-40250 is a high-severity vulnerability affecting OpenEXR, an image storage format widely used in the motion picture industry. This vulnerability allows for potential exploitation due to a flaw in the arithmetic operations performed in certain versions of OpenEXR. Specifically, in versions 3.4.0 through 3.4.9, 3.3.0 through 3.3.9, and 3.2.0 through 3.2.7, the code at `internal_dwa_compressor.h:1040` executes arithmetic calculations without proper type casting, which can lead to integer overflow. The urgency for defenders is clear, as this vulnerability can have significant impacts on confidentiality, integrity, and availability.
The vulnerability has been assigned a CVSS score of 8.4, indicating a high severity level. Attackers may leverage this vulnerability to compromise systems running affected versions of OpenEXR. Organizations using OpenEXR should prioritize patching to the latest versions, 3.4.10, 3.3.10, or 3.2.8, which address this specific issue. The risk to organizations includes potential data corruption and unauthorized access, emphasizing the need for immediate action.
The vulnerability was publicly disclosed on April 21, 2026, and its existence has been confirmed through various security advisories. As there are currently no known public exploits or proofs of concept, organizations are urged to assess their systems for vulnerabilities and apply necessary updates as soon as possible.
Organizations should prioritize patching immediately. Ensuring that systems are updated to at least version 3.4.10 will mitigate the risks associated with this vulnerability.
Vulnerability Details
The OpenEXR vulnerability is classified under CWE-190, which pertains to integer overflow in arithmetic operations. The flawed arithmetic operation occurs in the context of processing image files, where the width and bytes per element are multiplied without proper casting. This oversight can lead to significant data handling issues.
The CVSS score of 8.4 is indicative of the high threat level associated with this vulnerability. The potential impact on confidentiality, integrity, and availability is severe, making it crucial for organizations to take proactive measures.
The vulnerability affects OpenEXR versions 3.4.0 through 3.4.9, 3.3.0 through 3.3.9, and 3.2.0 through 3.2.7. The fixed versions are 3.4.10, 3.3.10, and 3.2.8, which should be deployed immediately to mitigate risks.
Technical Analysis
The root cause of this vulnerability lies within the incorrect arithmetic operation in the OpenEXR codebase. The calculation performed at `internal_dwa_compressor.h:1040` does not cast the result of `chan->width * chan->bytes_per_element` to the appropriate type, resulting in potential overflow scenarios. This flaw was similar to those addressed in other CVEs but was overlooked in this instance.
The attack vector for this vulnerability is local, which means that an attacker would need access to the affected system to exploit it. Exploitation complexity is classified as low, as successful exploitation may require only basic knowledge of the system's operation and the specific vulnerable version of OpenEXR.
In terms of required privileges, none are needed for an attacker to exploit this vulnerability, and user interaction is required. The impacts on confidentiality, integrity, and availability are assessed to be high, indicating that any exploitation could result in significant harm to the organization.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2026-40250 is considerable for organizations utilizing OpenEXR. The vulnerability exposes systems to potential data corruption, unauthorized access, and other adverse impacts. The blast radius for this vulnerability can extend to any system utilizing the affected versions of OpenEXR, indicating a wide range of potential compromise.
Given its high CVSS score, organizations should prioritize this vulnerability in their patch management processes. The vulnerability's presence in widely used image processing software compounds the urgency of remediation, as it can affect numerous applications and workflows.
Organizations should address this vulnerability in their priority patch cycle to mitigate the risks associated with exploitation and protect sensitive data.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
OpenEXR versions 3.4.0 through 3.4.9, 3.3.0 through 3.3.9, and 3.2.0 through 3.2.7 are affected by this vulnerability. Organizations should upgrade to the fixed versions: 3.4.10, 3.3.10, or 3.2.8 to address the issue.
Mitigation & Remediation
To mitigate the risks associated with CVE-2026-40250, organizations must apply patches from the vendor. Upgrade to versions 3.4.10, 3.3.10, or 3.2.8 to ensure the vulnerability is addressed. If immediate patching is not possible, consider implementing configuration hardening and network controls to minimize exposure.
Organizations can also evaluate their security posture through continuous penetration testing. This proactive approach can help identify vulnerabilities in their systems and provide insights for improving security measures.
Penetration testing can validate the effectiveness of the applied patches and ensure that no residual vulnerabilities remain.
Detection Guidance
Monitoring for indicators of exploitation is crucial. Organizations should review logs for unexpected behavior or anomalies during the processing of EXR files. Behavioral anomalies could include unusual memory usage patterns or crashes during image processing tasks.
System changes, such as unauthorized modifications to EXR processing routines, should also be closely monitored to identify potential exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-40250 highlights the importance of rigorous code reviews and testing, particularly in libraries that handle complex data types and operations. Security teams should take this as a reminder to prioritize secure coding practices to prevent similar vulnerabilities in the future.
This vulnerability represents a common pattern where integer overflows can lead to severe impacts if not addressed promptly. It underscores the need for thorough testing and validation of mathematical operations in software libraries.
Security teams should also evaluate their vulnerability management programs to ensure they are equipped to address such vulnerabilities effectively. Regular updates and assessments are critical to maintaining a secure environment.
Vulnerability management programs should incorporate lessons learned from vulnerabilities like CVE-2026-40250 to enhance defenses against future threats.
Penetration testing methodology should also be revisited to ensure it aligns with current threat landscapes and vulnerabilities.
API security best practices can also play a role in fortifying defenses against data vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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