CVE-2026-40683 | OpenStack Keystone up to 25.0.0/26.1.0/27.0.0/28.0.0 Configuration Options _ldap_res_to_model type confusion

VDB-357584 · CVE-2026-40683 · GCVE-0-2026-40683 OPENSTACK KEYSTONE UP TO 25.0.0/26.1.0/27.0.0/28.0.0 CONFIGURATION OPTIONS _LDAP_RES_TO_MODEL TYPE CONFUSION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.2 $0-$5k 1.53+ Summaryinfo A vulnerability labeled as problematic has been found in OpenStack Keystone up to 25.0.0/26.1.0/27.0.0/28.0.0. The impacted element is the function _ldap_res_to_model of the component Configuration Options Handler. Such manipulation leads to type confusion. This vulnerability is traded as CVE-2026-40683. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded. Detailsinfo A vulnerability was found in OpenStack Keystone up to 25.0.0/26.1.0/27.0.0/28.0.0 and classified as problematic. Affected by this issue is the function _ldap_res_to_model of the component Configuration Options Handler. The manipulation with an unknown input leads to a type confusion vulnerability. Using CWE to declare the problem leads to CWE-843. The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. Impacted is confidentiality, integrity, and availability. CVE summarizes: In OpenStack Keystone before 28.0.1, the LDAP identity backend does not convert the user enabled attribute to a boolean when the user_enabled_invert configuration option is False (the default). The _ldap_res_to_model method in the UserApi class only performed string-to-boolean conversion when user_enabled_invert was True. When False, the raw string value from LDAP (e.g., "FALSE") was used directly. Since non-empty strings are truthy in Python, users marked as disabled in LDAP were treated as enabled by Keystone, allowing them to authenticate and perform actions. All deployments using the LDAP identity backend without user_enabled_invert=True or user_enabled_emulation are affected. The advisory is shared for download at bugs.launchpad.net. This vulnerability is handled as CVE-2026-40683 since 04/14/2026. The exploitation is known to be difficult. The attack may be launched remotely. There are known technical details, but no exploit is available. Upgrading to version 25.0.1, 26.1.1, 27.0.1 or 28.0.1 eliminates this vulnerability. Productinfo Type Cloud Software Vendor OpenStack Name Keystone Version 25.0 26.0 26.1.0 27.0 28.0 License free Website Vendor: https://www.openstack.org/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.2 VulDB Base Score: 5.0 VulDB Temp Score: 4.8 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.7 CNA Vector (MITRE): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Type confusion CWE: CWE-843 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Keystone 25.0.1/26.1.1/27.0.1/28.0.1 Timelineinfo 04/14/2026 Advisory disclosed 04/14/2026 +0 days CVE reserved 04/14/2026 +0 days VulDB entry created 04/14/2026 +0 days VulDB entry last update Sourcesinfo Vendor: openstack.org Advisory: bugs.launchpad.net Status: Confirmed CVE: CVE-2026-40683 (🔒) GCVE (CVE): GCVE-0-2026-40683 GCVE (VulDB): GCVE-100-357584 Entryinfo Created: 04/14/2026 23:53 Changes: 04/14/2026 23:53 (65) Complete: 🔍 Cache ID: 99:3DD:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸