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Vulnerability · Published May 28, 2026 · Assigned by mitre

CVE-2026-49299

Medium 5.3

In plain English

A medium-severity incorrect authorization in Neutron from OpenStack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.3Medium
Exploit odds (30 days)0.3%top 77.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In OpenStack Neutron before 28.0.1, the tagging controller enforces plural policy action names on single-tag write operations while the defined policy rules use singular names. The mismatched names evaluate as allowed under the default policy, permitting a project reader to create and update tags on same-project resources. Deployments running Neutron 26.0.0 or later are affected.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12neutronno fix listedDEBIAN-CVE-2026-49299
Debian:13neutron2:26.0.0-9+deb13u1DEBIAN-CVE-2026-49299
Debian:14neutron2:28.0.0-4DEBIAN-CVE-2026-49299
PyPIneutron26.0.4, 27.0.3, 28.0.1PYSEC-2026-2678
PyPIneutron28.0.1GHSA-xv24-hxh9-2hh9
PyPIneutron27.0.3GHSA-xv24-hxh9-2hh9
PyPIneutron26.0.4GHSA-xv24-hxh9-2hh9
Ubuntu:22.04:LTSneutronno fix listedUBUNTU-CVE-2026-49299
Ubuntu:24.04:LTSneutronno fix listedUBUNTU-CVE-2026-49299
Ubuntu:25.10neutronno fix listedUBUNTU-CVE-2026-49299
Ubuntu:26.04:LTSneutronno fix listedUBUNTU-CVE-2026-49299
Ubuntu:26.10neutronno fix listedUBUNTU-CVE-2026-49299

Affected products (as reported)

VendorProductVersions
OpenStack Neutron 26.0.0 – before 26.0.427.0.0 – before 27.0.328.0.0 – before 28.0.1

Weakness: CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

References