CVE-2026-22185

OpenLDAP Lightning Memory-Mapped Database (LMDB) versions 0.9.14 before 0.9.34, 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.

CVSS 4.0

4.6CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-29)

CWEs

CWE-125, CWE-191

Published

2026-01-07

Modified

2026-10-29

Record from

the NVD, synced 2026-10-29

References

• https://bugs.openldap.org/show_bug.cgi?id=10421
• https://seclists.org/fulldisclosure/2026/Jan/5
• https://seclists.org/fulldisclosure/2026/Jan/8
• https://www.openldap.org/
• https://www.vulncheck.com/advisories/openldap-lmdb-mdb-load-heap-buffer-underflow-in-readline

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