CVE-2026-22185

A flaw was found in OpenLDAP Lightning Memory-Mapped Database (LMDB) mdb_load. When processing malformed input, a local attacker can exploit a heap buffer underflow vulnerability in the readline() function. This can lead to an out-of-bounds read, potentially causing a denial of service (DoS) and limited disclosure of heap memory contents.

This vulnerability is classified as Moderate rather than Important because its impact and exploitability are limited in scope and consequence. The flaw results in a one-byte heap out-of-bounds read caused by an integer underflow in mdb_load, which is a local, administrative utility rather than a long-running network-exposed service. Exploitation requires local execution and the ability to supply a malformed LMDB input file, significantly reducing the attack surface. While the issue can reliably trigger a process crash and may disclose minimal adjacent heap data, it does not allow memory corruption, privilege escalation, or arbitrary code execution. The confidentiality impact is low and bounded, and the availability impact is confined to the mdb_load invocation itself, not to the OpenLDAP daemon or directory service at runtime.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To reduce the risk from this vulnerability, administrators should avoid processing untrusted or externally supplied LMDB database files with mdb_load and restrict its use to trusted, local users only.