CVE-2026-22185 is a medium-severity vulnerability found in OpenLDAP Lightning Memory-Mapped Database (LMDB) versions up to and including 0.9.14. This vulnerability allows for a heap buffer underflow in the readline() function of mdb_load. Specifically, when processing malformed input that contains an embedded NUL byte, an unsigned offset calculation can underflow, resulting in an out-of-bounds read of one byte before the allocated heap buffer. Consequently, this can cause mdb_load to crash, leading to a limited denial-of-service condition.
The risk to organizations includes potential service disruptions, particularly in environments where LMDB is utilized for critical applications. As a result, organizations should prioritize patching this vulnerability to mitigate any associated risks.
As of now, there is no publicly available exploit for this vulnerability, and it has not been listed in the Known Exploited Vulnerabilities (KEV) database. However, its exploitation could lead to service interruptions, making it essential for organizations to stay vigilant.
Given the nature of this vulnerability, organizations should address it in their priority patch cycle to ensure the integrity and availability of their systems.
Vulnerability Details
The official description of CVE-2026-22185 notes that it affects OpenLDAP Lightning Memory-Mapped Database (LMDB) versions up to and including 0.9.14, prior to commit 8e1fda8. The vulnerability has a CVSS score of 4.6, indicating medium severity, primarily due to its limited availability impact.
The attack vector for this vulnerability is classified as local, with a low attack complexity and no privileges required. User interaction is required, as an active user must provide the malformed input that triggers the vulnerability.
This vulnerability falls under the CWE classifications of CWE-125 (Out-of-bounds Read) and CWE-191 (Integer Underflow).
Technical Analysis
The root cause of CVE-2026-22185 lies in the mishandling of malformed input in the readline() function of mdb_load. Specifically, the function does not adequately verify the integrity of the input before processing, allowing an embedded NUL byte to cause an unsigned offset calculation to underflow. This results in the function attempting to read memory outside the bounds of the allocated heap buffer.
The attack vector is local, meaning that an attacker would need access to the system where the LMDB instance is running. The attack complexity is low because the attacker only needs to craft the input correctly to trigger the vulnerability. No privileges are required, and user interaction is necessary, as the input must be provided by an active user.
The impact on availability is rated as low since the exploitation of this vulnerability will likely lead to a crash of the mdb_load process, causing the associated service to become temporarily unavailable until it is restarted.
Risk & Impact Analysis
Organizations utilizing OpenLDAP LMDB should consider the implications of CVE-2026-22185. The risk to their services includes potential downtimes and disruptions, especially in environments where LMDB is a critical component. It is essential to evaluate the blast radius of this vulnerability, as its localized nature means that only impacted services may experience outages.
The urgency for organizations to address this vulnerability is moderate due to the low CVSS score and limited availability impact. However, organizations should still schedule remediation as part of their routine maintenance to avoid any risks that could arise if the vulnerability is exploited.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of OpenLDAP Lightning Memory-Mapped Database (LMDB) prior to commit 8e1fda8, specifically up to and including version 0.9.14, are affected by this vulnerability.
Mitigation & Remediation
Organizations should prioritize upgrading to the latest version of OpenLDAP LMDB as soon as it is available to mitigate the risk posed by this vulnerability. If immediate patching is not possible, consider implementing strict input validation to prevent malformed data from being processed by mdb_load.
For further guidance on securing your systems, organizations may benefit from conducting a thorough penetration testing to identify potential weaknesses and bolster defenses.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor logs for unusual activity related to the mdb_load process. Additionally, behavioral anomalies such as unexpected crashes or service interruptions should be investigated promptly.
AppSecure Threat Intelligence Insight
CVE-2026-22185 highlights the ongoing challenges of maintaining software security, especially in local environments. As vulnerabilities arise, it is crucial for security teams to remain proactive in their security assessments to identify potential risks before they can be exploited.
This incident serves as a reminder of the importance of regular updates and the implementation of security best practices. Organizations should utilize resources such as the penetration testing methodology to strengthen their defenses against similar issues in the future.
By understanding vulnerabilities like CVE-2026-22185, organizations can better prepare themselves against potential threats and enhance their overall security posture.
For additional insights, organizations can review our resources on vulnerability management program design and the importance of a robust security framework.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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