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Full vulnerability report · 2026
CVE-2026-22185High confidence

OpenLDAP LMDB mdb_load Heap Buffer Underflow in readline()

OpenLDAP Foundation · OpenLDAP

4.6MediumCVSS 4.0
Recommended action
Patch only the product branches with a verified fix

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 37 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • EPSS is 0.15% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs OpenLDAP Foundation OpenLDAP and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 37 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

9 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 8 affected package states shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcelmdbAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian trixietrixie · sourceopenldapAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourcelmdbAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourceopenldapAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcelmdbAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourceopenldapAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcelmdbAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourceopenldapAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelmdbUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-22185 · CSAF 2.0 · revision 3 · finalRed Hat Product SecurityOpenLDAP: OpenLDAP LMDB: Denial of Service and Information Disclosure via Heap Buffer Underflow
29 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • openldap-clients as a component of Red Hat Enterprise Linux 10
  • openldap-compat as a component of Red Hat Enterprise Linux 10
  • openldap-devel as a component of Red Hat Enterprise Linux 10
  • openldap.src as a component of Red Hat Enterprise Linux 10
  • compat-openldap as a component of Red Hat Enterprise Linux 6
  • openldap as a component of Red Hat Enterprise Linux 6
  • openldap-clients as a component of Red Hat Enterprise Linux 6
  • openldap-devel as a component of Red Hat Enterprise Linux 6
  • openldap-servers as a component of Red Hat Enterprise Linux 6
  • openldap-servers-sql as a component of Red Hat Enterprise Linux 6
  • openldap.src as a component of Red Hat Enterprise Linux 6
  • compat-openldap.src as a component of Red Hat Enterprise Linux 7
Summary
A flaw was found in OpenLDAP Lightning Memory-Mapped Database (LMDB) mdb_load. When processing malformed input, a local attacker can exploit a heap buffer underflow vulnerability in the readline() function. This can lead to an out-of-bounds read, potentially causing a denial of service (DoS) and limited disclosure of heap memory contents.
Remediation
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.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-1169

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 37 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

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.

What

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.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through local access may attempt exploitation when the stated preconditions are met. If successful, the issue may disrupt the affected service.

What

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.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through local access may attempt exploitation when the stated preconditions are met. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

CISA Vulnrichment records proof-of-concept exploitation in its SSVC data. BlackTree has not independently executed or validated exploit material.

Likely attack path
local access → Out-of-bounds Read → disrupt the affected service
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
Active interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-125 ↗

CWE-125: Out-of-bounds Read. The product reads data past the end, or before the beginning, of the intended buffer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
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

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIActiveUser interaction: A user must take a deliberate action for exploitation to succeed.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VINoneVulnerable-system integrity: No direct loss is represented by this metric.VALowVulnerable-system availability: A successful attack can cause a limited loss.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
UnauthenticatedDenial of serviceCWE-125Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2026-0036OpenLDAP: Schwachstelle ermöglicht Denial of Service und Offenlegung von Informationen

Ein lokaler Angreifer kann eine Schwachstelle in OpenLDAP ausnutzen, um einen Denial of Service Angriff durchzuführen und um Informationen offenzulegen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260114Security Bulletin 14 Jan 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 14 Jan 2026, published on 14 January 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0326Multiples vulnérabilités dans les produits VMware

rg/CVERecord?id=CVE-2026-1225 Référence CVE CVE-2026-1299 https://www.cve.org/CVERecord?id=CVE-2026-1299 Référence CVE CVE-2026-1642 https://www.cve.org/CVERecord?id=CVE-2026-1642 Référence CVE CVE-2026-1703 https://www.cve.org/CVERecord?id=CVE-2026-1703 Référence CVE CVE-2026-1788 https://www.cve.org/CVERecord?id=CVE-2026-1788 Référence CVE CVE-2026-1965 https://www.cve.org/CVERecord?id=CVE-2026-1965 Référence CVE CVE-2026-21441 https://www.cve.org/CVERecord?id=CVE-2026-21441 Référence CVE CVE-2026-21636 https://www.cve.org/CVERecord?id=CVE-2026-21636 Référence CVE CVE-2026-21637 https://www.cve.org/CVERecord?id=CVE-2026-21637 Référence CVE CVE-2026-22185 https://www.cve.org/CVERecord?id=CVE-2026-22185 Référence CVE CVE-2026-2219 https://www.cve.org/CVERecord?id=CVE-2026-2219 Référence CVE CVE-2026-2243 https://www.cve.org/CVERecord?id=CVE-2026-2243 Référence CVE CVE-2026-22795 https://www.cve.org/CVERecord?id=CVE-2026-22795 Référence CVE CVE-2026-22796 https://www.cve.org/CVERecord?id=CVE-2026-22796 Référence CVE CVE-2026-22860 https://www.cve.org/CVERecord?id=CVE-2026-22860 Référence CVE CVE-2026-2297 https://www.cve.org/CVERecord?id=CVE-2026-2297 Référence CVE CVE-2026-22976 https://www.cve.org/CVERecord?id=CVE-2026-22976 Référence CVE CVE-2026-22977 https://www.cve.org/CVERecord?id=CVE-20

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0316Multiples vulnérabilités dans les produits VMware

rg/CVERecord?id=CVE-2026-0968 Référence CVE CVE-2026-1229 https://www.cve.org/CVERecord?id=CVE-2026-1229 Référence CVE CVE-2026-1299 https://www.cve.org/CVERecord?id=CVE-2026-1299 Référence CVE CVE-2026-1642 https://www.cve.org/CVERecord?id=CVE-2026-1642 Référence CVE CVE-2026-1788 https://www.cve.org/CVERecord?id=CVE-2026-1788 Référence CVE CVE-2026-1965 https://www.cve.org/CVERecord?id=CVE-2026-1965 Référence CVE CVE-2026-21441 https://www.cve.org/CVERecord?id=CVE-2026-21441 Référence CVE CVE-2026-21636 https://www.cve.org/CVERecord?id=CVE-2026-21636 Référence CVE CVE-2026-21637 https://www.cve.org/CVERecord?id=CVE-2026-21637 Référence CVE CVE-2026-22185 https://www.cve.org/CVERecord?id=CVE-2026-22185 Référence CVE CVE-2026-2219 https://www.cve.org/CVERecord?id=CVE-2026-2219 Référence CVE CVE-2026-2243 https://www.cve.org/CVERecord?id=CVE-2026-2243 Référence CVE CVE-2026-22795 https://www.cve.org/CVERecord?id=CVE-2026-22795 Référence CVE CVE-2026-22796 https://www.cve.org/CVERecord?id=CVE-2026-22796 Référence CVE CVE-2026-22860 https://www.cve.org/CVERecord?id=CVE-2026-22860 Référence CVE CVE-2026-2297 https://www.cve.org/CVERecord?id=CVE-2026-2297 Référence CVE CVE-2026-22976 https://www.cve.org/CVERecord?id=CVE-2026-22976 Référence CVE CVE-2026-22977 https://www.cve.org/CVERecord?id=CVE-20

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0266Multiples vulnérabilités dans VMware Tanzu

.cve.org/CVERecord?id=CVE-2026-0988 Référence CVE CVE-2026-0989 https://www.cve.org/CVERecord?id=CVE-2026-0989 Référence CVE CVE-2026-0990 https://www.cve.org/CVERecord?id=CVE-2026-0990 Référence CVE CVE-2026-0992 https://www.cve.org/CVERecord?id=CVE-2026-0992 Référence CVE CVE-2026-1484 https://www.cve.org/CVERecord?id=CVE-2026-1484 Référence CVE CVE-2026-1485 https://www.cve.org/CVERecord?id=CVE-2026-1485 Référence CVE CVE-2026-1489 https://www.cve.org/CVERecord?id=CVE-2026-1489 Référence CVE CVE-2026-1757 https://www.cve.org/CVERecord?id=CVE-2026-1757 Référence CVE CVE-2026-2100 https://www.cve.org/CVERecord?id=CVE-2026-2100 Référence CVE CVE-2026-22185 https://www.cve.org/CVERecord?id=CVE-2026-22185 Référence CVE CVE-2026-24883 https://www.cve.org/CVERecord?id=CVE-2026-24883 Référence CVE CVE-2026-26960 https://www.cve.org/CVERecord?id=CVE-2026-26960 Référence CVE CVE-2026-27171 https://www.cve.org/CVERecord?id=CVE-2026-27171 Gestion détaillée du document le 11 mars 2026 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À propos Contact cyber.gouv.fr service-public.fr legifrance.gouv.fr info.gouv.fr france.fr info.gouv.fr/risques Premier Ministre / Secrétariat Général de la Défense et de la Sécurité Nationale / Agence nationale de la sécurité des sy

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
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.
04

Evidence and provenance

Published 7 Jan 2026 · Last source change 25 May 2026, 23:41 UTC · CWE-125 · Out-of-bounds Read

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-1169
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD not scheduled

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    openldap-clients as a component of Red Hat Enterprise Linux 10; openldap-compat as a component of Red Hat Enterprise Linux 10; openldap-devel as a component of Red Hat Enterprise Linux 10; openldap.src as a component of Red Hat Enterprise Linux 10; compat-openldap as a component of Red Hat Enterprise Linux 6; openldap as a component of Red Hat Enterprise Linux 6; openldap-clients as a component of Red Hat Enterprise Linux 6; openldap-devel as a component of Red Hat Enterprise Linux 6; openldap-servers as a component of Red Hat Enterprise Linux 6; openldap-servers-sql as a component of Red Hat Enterprise Linux 6; openldap.src as a component of Red Hat Enterprise Linux 6; compat-openldap.src as a component of Red Hat Enterprise Linux 7; openldap as a component of Red Hat Enterprise Linux 7; openldap-clients as a component of Red Hat Enterprise Linux 7; openldap-devel as a component of Red Hat Enterprise Linux 7; openldap-servers as a component of Red Hat Enterprise Linux 7; openldap-servers-sql as a component of Red Hat Enterprise Linux 7; openldap.src as a component of Red Hat Enterprise Linux 7; openldap as a component of Red Hat Enterprise Linux 8; openldap-clients as a component of Red Hat Enterprise Linux 8; openldap-devel as a component of Red Hat Enterprise Linux 8; openldap-servers as a component of Red Hat Enterprise Linux 8; openldap.src as a component of Red Hat Enterprise Linux 8; openldap-clients as a component of Red Hat Enterprise Linux 9; openldap-compat as a component of Red Hat Enterprise Linux 9; openldap-devel as a component of Red Hat Enterprise Linux 9; openldap.src as a component of Red Hat Enterprise Linux 9; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4
    After
    openldap-clients as a component of Red Hat Enterprise Linux 10; openldap-compat as a component of Red Hat Enterprise Linux 10; openldap-devel as a component of Red Hat Enterprise Linux 10; openldap.src as a component of Red Hat Enterprise Linux 10; compat-openldap as a component of Red Hat Enterprise Linux 6; openldap as a component of Red Hat Enterprise Linux 6; openldap-clients as a component of Red Hat Enterprise Linux 6; openldap-devel as a component of Red Hat Enterprise Linux 6; openldap-servers as a component of Red Hat Enterprise Linux 6; openldap-servers-sql as a component of Red Hat Enterprise Linux 6; openldap.src as a component of Red Hat Enterprise Linux 6; compat-openldap.src as a component of Red Hat Enterprise Linux 7; openldap as a component of Red Hat Enterprise Linux 7; openldap-clients as a component of Red Hat Enterprise Linux 7; openldap-devel as a component of Red Hat Enterprise Linux 7; openldap-servers as a component of Red Hat Enterprise Linux 7; openldap-servers-sql as a component of Red Hat Enterprise Linux 7; openldap.src as a component of Red Hat Enterprise Linux 7; openldap as a component of Red Hat Enterprise Linux 8; openldap-clients as a component of Red Hat Enterprise Linux 8; openldap-devel as a component of Red Hat Enterprise Linux 8; openldap-servers as a component of Red Hat Enterprise Linux 8; openldap.src as a component of Red Hat Enterprise Linux 8; openldap-clients as a component of Red Hat Enterprise Linux 9; openldap-compat as a component of Red Hat Enterprise Linux 9; openldap-devel as a component of Red Hat Enterprise Linux 9; openldap.src as a component of Red Hat Enterprise Linux 9; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4
    Red Hat Product Security ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-1169↗Vendor CSAF · Red Hat Product Security↗CISA Vulnrichment SSVC evidence↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-22185 · cve.blacktree.nl