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CVE-2026-55707

HIGH
7.1
CVSS Score
Published: August 5, 2026 at 04:44 AM UTC
Updated: October 24, 2026 at 04:10 PM UTC
1 product affected across 1 vendorNeutron

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Severity
HIGH7.1
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

In OpenStack Neutron before 28.0.2, the subnetpool onboarding API does not verify ownership of the target subnets. An authenticated user can onboard subnets from another project's shared network into their own subnetpool, mutating the victim's subnet state and altering L3 routing and address scope behavior for victim routers.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Neutron· Openstack
90%
14.0.0 ≤ v < 26.0.627.0.0 ≤ v < 27.0.428.0.0 ≤ v < 28.0.214.0.027.0.028.0.0
Affected range stops below 26.0.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 27.0.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 28.0.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

Issue Tracking
Source: cverecord
https://launchpad.net/bugs/2152113
Vendor Advisory
Source: cverecord
https://security.openstack.org/ossa/OSSA-2026-032.html
Vendor AdvisoryMailing List
Source: cverecord
https://www.openwall.com/lists/oss-security/2026/07/29/5
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2026/07/29/5
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2026/08/msg00024.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHmitre
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-863

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