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CVE-2026-49299

OpenStack Neutron has an Incorrect Authorization issue

5.3 MediumFix available

CVE-2026-49299 is a medium vulnerability (CVSS 5.3) in Openstack Neutron, published May 28, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.29%, the 22nd percentile. Fixed in neutron 28.0.1.

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

0.29%Up 0.3 points since May 29, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.3

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.

Record
CVE-2026-49299
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-863
Updated
2026-11-02
EUVDEUVD-2026-33074 5.3

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.

Record
EUVD-2026-33074
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-xv24-hxh9-2hh9 5.3

OpenStack Neutron has an Incorrect Authorization issue

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.

Record
GHSA-xv24-hxh9-2hh9
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-863
Updated
2026-11-02
NVD 5.3

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.

Record
CVE-2026-49299
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-863
Updated
2026-11-02
OSV 5.3

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.

Record
CVE-2026-49299
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-863
Updated
2026-11-02
OSVDEBIAN-CVE-2026-49299 5.3

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.

Record
DEBIAN-CVE-2026-49299
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVGHSA-xv24-hxh9-2hh9 5.3

OpenStack Neutron has an Incorrect Authorization issue

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.

Record
GHSA-xv24-hxh9-2hh9
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-863
Updated
2026-11-02
OSVPYSEC-2026-2678 5.3

OpenStack Neutron has an Incorrect Authorization issue

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.

Record
PYSEC-2026-2678
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-49299 5.3

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.

Record
UBUNTU-CVE-2026-49299
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
neutron
PyPI
28.0.0 up to 28.0.1
28.0.1
neutron
PyPI
27.0.0 up to 27.0.3
27.0.3
neutron
PyPI
26.0.0 up to 26.0.4
26.0.4
neutron
Debian:12
All versions, plus listed versions
2:21.0.0-72:21.0.0-7+deb12u12:22.0.0-12:22.0.0-22:22.0.0~rc1-1
Show 45 moreShow less
2:22.0.0~rc1-22:22.0.1-12:22.0.1-22:23.0.0-12:23.0.0-22:23.0.0~b3-12:23.0.0~rc1-12:24.0.0-12:24.0.0-22:24.0.0-32:24.0.0-3.12:24.0.0~rc1-12:25.0.0-12:25.0.0-22:25.0.0-32:25.0.0-42:25.0.0-52:25.0.0~rc1-12:25.0.0~rc1-22:25.0.0~rc2-12:25.1.0-12:25.1.0-32:26.0.0-12:26.0.0-22:26.0.0-32:26.0.0-42:26.0.0-52:26.0.0-62:26.0.0-82:26.0.0-92:26.0.0~rc1-12:26.0.0~rc1-32:26.0.0~rc2-12:27.0.0-12:27.0.0~rc1-12:27.0.0~rc1-22:27.0.1-12:27.0.1-22:27.0.1-32:27.0.1-42:27.0.1-52:27.0.1-62:28.0.0-12:28.0.0-22:28.0.0-3
None known
neutron
Debian:13
before 2:26.0.0-9+deb13u1, plus listed versions
2:26.0.0-9
2:26.0.0-9+deb13u1
neutron
Debian:14
before 2:28.0.0-4, plus listed versions
2:26.0.0-92:27.0.0-12:27.0.0~rc1-12:27.0.0~rc1-22:27.0.1-1
Show 12 moreShow less
2:27.0.1-22:27.0.1-32:27.0.1-42:27.0.1-52:27.0.1-62:28.0.0-12:28.0.0-22:28.0.0-32:28.0.0~rc1-12:28.0.0~rc1-22:28.0.0~rc2-12:28.0.0~rc2-2
2:28.0.0-4
neutron
PyPI
27.0.0 up to 27.0.3, plus listed versions
27.0.127.0.2
27.0.3
neutron
PyPI
26.0.0 up to 26.0.4, plus listed versions
26.0.126.0.226.0.3
26.0.4
neutron
PyPI
26.0.0 up to 26.0.4, 27.0.0 up to 27.0.3, 28.0.0 up to 28.0.1, plus listed versions
26.0.126.0.226.0.327.0.127.0.2
26.0.427.0.328.0.1
neutron
Ubuntu:16.04:LTS
All versions, plus listed versions
2:7.0.0-0ubuntu12:8.0.0~b1-0ubuntu22:8.0.0~b2-0ubuntu42:8.0.0~b2-0ubuntu52:8.0.0~b2-0ubuntu7
Show 20 moreShow less
2:8.0.0~b3-0ubuntu12:8.0.0~rc1-0ubuntu12:8.0.0-0ubuntu12:8.1.0-0ubuntu0.16.04.22:8.1.2-0ubuntu12:8.2.0-0ubuntu12:8.3.0-0ubuntu12:8.3.0-0ubuntu1.12:8.3.0-0ubuntu1.22:8.4.0-0ubuntu12:8.4.0-0ubuntu22:8.4.0-0ubuntu32:8.4.0-0ubuntu42:8.4.0-0ubuntu52:8.4.0-0ubuntu62:8.4.0-0ubuntu7.12:8.4.0-0ubuntu7.22:8.4.0-0ubuntu7.32:8.4.0-0ubuntu7.42:8.4.0-0ubuntu7.5
None known
Show 7 moreShow less
Affected packages
PackageAffectedFixed
neutron
Ubuntu:18.04:LTS
All versions, plus listed versions
2:11.0.1-0ubuntu12:12.0.0~b1-0ubuntu12:12.0.0~b1-0ubuntu22:12.0.0~b2-0ubuntu12:12.0.0~b3-0ubuntu1
Show 27 moreShow less
2:12.0.0~rc1-0ubuntu12:12.0.0~rc2-0ubuntu12:12.0.0-0ubuntu12:12.0.0-0ubuntu1.12:12.0.0-0ubuntu1.22:12.0.0-0ubuntu1.32:12.0.0-0ubuntu1.42:12.0.0-0ubuntu22:12.0.0-0ubuntu32:12.0.1-0ubuntu12:12.0.1-0ubuntu1.12:12.0.2-0ubuntu12:12.0.3-0ubuntu12:12.0.5-0ubuntu12:12.0.5-0ubuntu42:12.0.5-0ubuntu52:12.0.6-0ubuntu12:12.0.6-0ubuntu22:12.0.6-0ubuntu32:12.1.0-0ubuntu12:12.1.1-0ubuntu12:12.1.1-0ubuntu22:12.1.1-0ubuntu32:12.1.1-0ubuntu42:12.1.1-0ubuntu72:12.1.1-0ubuntu82:12.1.1-0ubuntu8.1
None known
neutron
Ubuntu:20.04:LTS
All versions, plus listed versions
2:15.0.0-0ubuntu12:16.0.0~b1~git2019121613.3e8abb9a8f-0ubuntu12:16.0.0~b2~git2020020712.d5b33ffc77-0ubuntu12:16.0.0~b2~git2020020712.d5b33ffc77-0ubuntu32:16.0.0~b3~git2020032420.a0e1b5804e-0ubuntu1
Show 31 moreShow less
2:16.0.0~b3~git2020032420.a0e1b5804e-0ubuntu22:16.0.0~b3~git2020032420.a0e1b5804e-0ubuntu32:16.0.0~b3~git2020032420.a0e1b5804e-0ubuntu42:16.0.0~b3~git2020041013.e74c8f8c88-0ubuntu12:16.0.0~b3~git2020041516.5f42488a9a-0ubuntu12:16.0.0~b3~git2020041516.5f42488a9a-0ubuntu22:16.0.0-0ubuntu0.20.04.12:16.0.0-0ubuntu0.20.04.22:16.1.0-0ubuntu12:16.1.0-0ubuntu22:16.2.0-0ubuntu12:16.2.0-0ubuntu22:16.2.0-0ubuntu32:16.3.0-0ubuntu32:16.3.1-0ubuntu12:16.3.1-0ubuntu1.12:16.3.2-0ubuntu22:16.3.2-0ubuntu32:16.4.0-0ubuntu22:16.4.0-0ubuntu32:16.4.1-0ubuntu22:16.4.2-0ubuntu12:16.4.2-0ubuntu22:16.4.2-0ubuntu32:16.4.2-0ubuntu42:16.4.2-0ubuntu52:16.4.2-0ubuntu62:16.4.2-0ubuntu6.12:16.4.2-0ubuntu6.22:16.4.2-0ubuntu6.32:16.4.2-0ubuntu6.4
None known
neutron
Ubuntu:22.04:LTS
All versions, plus listed versions
2:19.0.0-0ubuntu12:19.1.0+git2022030313.b072cbf05f-0ubuntu12:20.0.0-0ubuntu12:20.0.0-0ubuntu22:20.0.0-0ubuntu3
Show 9 moreShow less
2:20.1.0-0ubuntu22:20.2.0-0ubuntu12:20.3.0-0ubuntu12:20.3.0-0ubuntu1.12:20.3.1-0ubuntu12:20.4.0-0ubuntu12:20.5.0-0ubuntu12:20.5.0-0ubuntu22:20.5.0-0ubuntu2.1
None known
neutron
Ubuntu:24.04:LTS
All versions, plus listed versions
2:23.0.0-0ubuntu12:24.0.0~b1+git2024011914.5ce17647-0ubuntu12:24.0.0~rc1-0ubuntu22:24.0.0-0ubuntu12:24.0.0-0ubuntu2
Show 4 moreShow less
2:24.1.0-0ubuntu12:24.1.0-0ubuntu1.12:24.1.0-0ubuntu1.22:24.2.2-0ubuntu0.24.04.1
None known
neutron
Ubuntu:25.10
All versions, plus listed versions
2:26.0.0-0ubuntu12:26.0.1+git2025070714.71962255de-0ubuntu12:26.0.1+git2025070714.71962255de-0ubuntu22:27.0.0~rc1-0ubuntu12:27.0.0-0ubuntu12:27.0.0-0ubuntu1.1
None known
neutron
Ubuntu:26.10
All versions, plus listed versions
2:28.0.0-0ubuntu12:28.0.0-0ubuntu22:29.0.0~b1+git20260818.132.9aaa6fa-0ubuntu12:29.0.0~rc1-0ubuntu12:29.0.0-0ubuntu1
None known
neutron
Ubuntu:26.04:LTS
All versions, plus listed versions
2:27.0.0-0ubuntu12:28.0.0~b2+git20260121.28.762694d1bd-0ubuntu12:28.0.0~rc1-0ubuntu12:28.0.0~rc2-0ubuntu12:28.0.0-0ubuntu12:28.0.0-0ubuntu1.12:28.0.2-0ubuntu1
None known

History

History
WhenChangedSources
2026-11-02aliases, publishedEUVD
2026-11-02createdCVE List, GitHub Advisories, NVD, OSV

References

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