Out-of-bounds Read in Openldap Foundation
CVE-2026-22185
OpenLDAP Lightning Memory-Mapped Database (LMDB) versions up to and including 0.9.14, prior to commit 8e1fda8, contain a heap buffer underflow in the readline() function of mdb_load. When processing malformed input containing an embedded NUL byte, an unsigned offset calculation can underflow and cause an out-of-bounds read of one byte before the allocated heap buffer. This can cause mdb_load to crash, leading to a limited denial-of-service condition.
Vulnerability class: Buffer Overflow
Published · last modified .
EPSS exploit prediction
EPSS: 0.001 (3.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- Openldap Foundation — versions 0.9.14
Weakness classification (CWE)
References
- seclists.org/fulldisclosure/2026/Jan/5 (technical-description, exploit)
- seclists.org/fulldisclosure/2026/Jan/8 (technical-description, exploit)
- www.openldap.org/ (product)
- www.vulncheck.com/advisories/openldap-lmdb-mdb-load-heap-buffer-underflow-in-re… (third-party-advisory)
- bugs.openldap.org/show_bug.cgi (issue-tracking, patch)