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Advisory details: pypa / keystone/PYSEC-2026-602
Advisory ID pypa/keystone/PYSEC-2026-602
Aliases CVE-2026-43001
GHSA-hhq2-3832-xxcv
PYSEC-2026-602
Summary An issue was discovered in OpenStack Keystone before 29.0.2. POST /v3/credentials did not validate that the caller-supplied project_id for an EC2-type credential matched the project of the authenticating application credential. This allowed an attacker holding an unrestricted application credential for project A to create an EC2 credential targeting project B; a subsequent /v3/ec2tokens exchange would then issue a Keystone token scoped to project B while still carrying the original app_cred_id, enabling cross-project lateral movement within the credential owner's role footprint.
Status Published
Exploitability 0.5
Weighted Severity 7.2
Risk 3.6
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (0)
There are no known CWE.
System Score Found at
cvssv3.1 8.0 https://github.com/pypa/advisory-database/blob/main/vulns/keystone/PYSEC-2026-602.yaml
Reference id Reference type URL
https://access.redhat.com/security/cve/CVE-2026-43001
https://bugs.launchpad.net/keystone/+bug/2149775
https://bugzilla.redhat.com/show_bug.cgi?id=2464305
https://review.opendev.org/c/openstack/keystone/+/985804
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43001.json
https://security.openstack.org/ossa/OSSA-2026-015.html
GHSA-hhq2-3832-xxcv https://github.com/advisories/GHSA-hhq2-3832-xxcv

No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/pypa/advisory-database/blob/main/vulns/keystone/PYSEC-2026-602.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-01T13:28:01Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/43xxx/CVE-2026-43001.json

Source Advisory: vulnrichment/CVE-2026-43001

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]