Bio-Formats versions up to and including 8.3.0 perform unsafe Java deserialization of attacker-controlled memoization cache files (.bfmemo) during image processing. The loci.formats.Memoizer class automatically loads and deserializes memo files associated with images without validation, integrity checks, or trust enforcement. An attacker who can supply a crafted .bfmemo file alongside an image can trigger deserialization of untrusted data, which may result in denial of service, logic manipulation, or potentially remote code execution in environments where suitable gadget chains are present on the classpath.
The CVSS score for this vulnerability is 6.8, indicating a medium severity level. This score reflects the potential impact to confidentiality, integrity, and availability, particularly highlighting a high impact on availability. Organizations utilizing vulnerable versions should take this risk into account, as exploitation could lead to significant disruptions in services.
Currently, there are known exploits for this vulnerability. Attackers may leverage this flaw to execute untrusted code, raising the urgency for organizations to address this issue in their patch cycles. Organizations should prioritize patching immediately.
Given the nature of this vulnerability, organizations are advised to schedule remediation as a priority. Patching should be implemented as soon as updates are available, and alternative measures should be considered until full remediation can be achieved.
Vulnerability Details
This vulnerability allows for unsafe Java deserialization within Bio-Formats, specifically affecting versions up to and including 8.3.0. The potential for denial of service and remote code execution underscores the importance of addressing this flaw.
The official CVSS 4.0 score is 6.8, which reflects a medium severity classification, while the CVSS 3.1 score is 7.8, classified as high severity. The vulnerability impacts confidentiality, integrity, and availability, with the highest impact being on availability.
The affected product is OpenMicroscopy's Bio-Formats, and the vulnerability was published on January 7, 2026. The Common Weakness Enumeration (CWE) classification for this vulnerability is CWE-502.
Technical Analysis
The root cause of this vulnerability is the unsafe deserialization of .bfmemo files, which can be controlled by an attacker. The attack vector is local, requiring the attacker to have access to the system where the deserialization occurs.
The attack complexity is low, and no privileges are required for exploitation. However, user interaction is necessary as the crafted file must be supplied alongside the image.
The vulnerability has low confidentiality and integrity impact but has a high availability impact, which can lead to denial of service under certain circumstances.
Risk & Impact Analysis
Risk to organizations includes potential denial of service and unauthorized code execution, leading to significant operational disruptions. The blast radius could be high if exploited in environments with extensive use of Bio-Formats.
Organizations should assess their exposure and prioritize their patching processes. The CVSS score and the presence of known exploits necessitate immediate attention, emphasizing the need for timely remediation.
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of Bio-Formats prior to 8.4.0 are affected by this vulnerability. Organizations should ensure they are running the patched version to mitigate risks.
Mitigation & Remediation
Organizations should prioritize patching immediately. Upgrade to Bio-Formats version 8.4.0 or later as soon as it is available. In the meantime, consider implementing configuration hardening measures and monitoring for anomalous behavior related to .bfmemo files.
For ongoing protection, organizations may also benefit from conducting a thorough security assessment, including application security assessments to identify potential weaknesses.
Detection Guidance
Organizations should monitor logs for indicators of exploitation, including unusual access patterns to .bfmemo files or associated images. Additionally, behavioral anomalies in image processing tasks should be investigated.
AppSecure Threat Intelligence Insight
This vulnerability highlights the importance of secure deserialization practices within software development. As organizations increasingly rely on third-party libraries, security teams must ensure thorough vetting and testing of these components to prevent similar vulnerabilities.
For more insights on vulnerability management, consider reading about vulnerability management programs or the latest trends in ransomware targeting that could affect your organization.
Additionally, exploring penetration testing methodologies can enhance your organization's overall security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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