EUVD-2026-48477
GHSA-gmmh-575h-g7v8
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Network-reachable API with no credentials required, but UUID knowledge prerequisite justifies AC:H; impact confined to queue read and availability disruption with no confirmed integrity impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
OpenStack Zaqar through 22.0.0 allows authentication bypass via an EXTRA-SPEC header when a UUID is known.
AnalysisAI
Authentication bypass in OpenStack Zaqar through version 22.0.0 allows network-reachable attackers without credentials to circumvent access controls by supplying a crafted EXTRA-SPEC HTTP header paired with a known queue UUID. The root cause is CWE-306 (Missing Authentication for Critical Function), meaning the service fails to enforce credential validation on certain request paths when this header is present. No public exploit code has been identified at time of analysis and no CISA KEV listing exists, but the network-accessible nature of Zaqar's REST API makes this a meaningful risk for deployments where queue UUIDs may be discoverable through logs or enumeration.
Technical ContextAI
OpenStack Zaqar is the message queuing and notification service within the OpenStack ecosystem, providing multi-tenant, REST API-driven message queues and subscriptions. The affected CPE is cpe:2.3:a:openstack:zaqar:*:*:*:*:*:*:*:*, covering all releases through 22.0.0. CWE-306 (Missing Authentication for Critical Function) identifies the root cause as a gap in authentication enforcement: when an inbound HTTP request carries the EXTRA-SPEC header, the service's authentication middleware or dispatch layer bypasses credential validation, using the supplied UUID as an implicit access gate rather than verifying identity. This is a design-level flaw in how Zaqar processes special request headers rather than a memory-safety or injection issue. Queue UUIDs in OpenStack are non-sequential but may appear in API responses, log files, or monitoring telemetry, making them discoverable in practice.
RemediationAI
No vendor-released patched version has been independently confirmed from the available data - fix status must be verified directly via the OpenStack Security Advisory at https://bugs.launchpad.net/ossa/+bug/2161254 and the oss-security disclosure at https://www.openwall.com/lists/oss-security/2026/07/23/7. As a primary compensating control, operators should restrict network access to Zaqar API endpoints using firewall rules or OpenStack network policies so that only trusted internal networks or authenticated reverse proxies can reach the service, eliminating the network-accessible attack surface entirely; the trade-off is reduced API accessibility for external consumers. Additionally, auditing and rotating Zaqar queue UUIDs, and ensuring they do not appear in shared logs, monitoring outputs, or API responses accessible to untrusted parties, reduces the likelihood of UUID enumeration by attackers. Where a reverse proxy (nginx, HAProxy) fronts Zaqar, stripping the EXTRA-SPEC request header before forwarding may block the bypass path without requiring an application-layer patch, though this should be validated against legitimate use cases that may rely on this header.
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External POC / Exploit Code
Leaving vuln.today