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Fencer Vulns
medium 4.6

CVE-2026-22185 json

OpenLDAP LMDB mdb_load Heap Buffer Underflow in readline()

published 2026-01-07 10 mo ago modified 2026-10-29 10 d ago also EUVD-2026-1169

cvss
4.6
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

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.

Patch / fix

  • OpenLDAP Foundation OpenLDAP 0.9.34
  • lmdb Debian 14 0.9.35-1

debian advisories DEBIAN-CVE-2026-22185

  • openldap2_5 SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7, openSUSE Leap 15.6 2.5.20+11-150500.11.38.1

suse advisories SUSE-SU-2026:0256-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-22185 updated cvss 6.8

OpenLDAP: OpenLDAP LMDB: Denial of Service and Information Disclosure via Heap Buffer Underflow

  • Red Hat Enterprise Linux 6 openldap, compat-openldap, openldap-clients, openldap-servers, openldap-servers-sql Red Hat Enterprise Linux 7 openldap, compat-openldap, openldap-clients, openldap-servers, openldap-servers-sql Red Hat Enterprise Linux 8 openldap, openldap-clients, openldap-servers Red Hat Enterprise Linux 9 openldap, openldap-compat, openldap-clients Red Hat Enterprise Linux 10 openldap Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “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.”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-core-bff-rhel9, rhoai/odh-dashboard-rhel9, rhoai/odh-mod-arch-maas-rhel9, rhoai/odh-mod-arch-automl-rhel9, rhoai/odh-mod-arch-gen-ai-rhel9, rhoai/odh-mod-arch-mlflow-rhel9, +6 more
    under investigation
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-kube-rbac-proxy-rhel9, rhoai/odh-maas-controller-rhel9, rhoai/odh-mlflow-operator-rhel9, rhoai/odh-model-controller-rhel9, rhoai/odh-ogx-k8s-operator-rhel9, +14 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • seclists.org https://seclists.org/fulldisclosure/2026/Jan/5 referenced PoC, tagged "exploit" by a source, unverified
  • seclists.org https://seclists.org/fulldisclosure/2026/Jan/8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 4.6 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CNA 4.0 4.6 CVSS: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

Affected products

  • OpenLDAP Foundation OpenLDAP

Classification

Weakness
  • CWE-125 Out-of-bounds Read
  • CWE-191 Integer Underflow (Wrap or Wraparound)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.