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.

CVSS v4.0

4.6 MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS

0.14% chance of exploitation in the next 30 days, 3th percentile

Published

2026-01-07

Updated

2026-05-25

Proof-of-concept exploits (2)

• https://seclists.org/fulldisclosure/2026/Jan/5
• https://seclists.org/fulldisclosure/2026/Jan/8

References

• CVE Record
• NVD entry

Related

• CVE-2026-22184
• CVE-2026-22186
• CVE-2026-2218
• CVE-2026-22187
• CVE-2026-2217
• CVE-2026-22188