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.

• openldap (unimportant)
• lmdb (bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1126287) [trixie] - lmdb (Minor issue) [bookworm] - lmdb (Minor issue) [bullseye] - lmdb (Minor issue, OOB read) https://seclists.org/fulldisclosure/2026/Jan/5 https://bugs.openldap.org/show_bug.cgi?id=10421 Fixed by: https://git.openldap.org/openldap/openldap/-/commit/8e1fda85532a3c74276df38a42d234dcdfa1e40d OpenLDAP bundles lmdb but does not build mdb_load.c