🛡️ CVE-2026-40683 on Debian — keystone

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Distribution advisory

This page covers CVE-2026-40683 as tracked by Debian, for the package keystone. The fix is available in version 2:29.0.0~rc1-2; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity low, availability high.

Weakness class

DEBIAN-CVE-2026-40683 is classified as CWE-843: Type Confusion. A resource is accessed as one type while actually being another, so the interpretation of its memory is wrong.

Affected software

DEBIAN-CVE-2026-40683 is recorded against 1 package.

  • keystone (fixed in 2:29.0.0~rc1-2)

Timeline and source

Published on 14 April 2026 and last revised on 6 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2026-40683 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-04-14
Updated 2026-08-20
Modified 2026-08-06
Fix URL N/A

Affected Packages

Software From version Fixed in
keystone — 2:29.0.0~rc1-2

Similar Threats

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