CVE-2026-55707

unknown

Published 2026-08-05 · Modified 2026-08-05

CVSS v3

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CVSS v4 NEW

7.1

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/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

VIR risk

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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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Debian Security Tracker · View original ↗ · DFSG

CVE-2026-55707 NameCVE-2026-55707 SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) Debian Bugs1143170 Vulnerable and fixed packages The table below lists information on source packages. Source PackageReleaseVersionStatus neutron (PTS)bullseye (security),…

CVE-2026-55707

Name	CVE-2026-55707
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1143170

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
neutron (PTS)	bullseye (security), bullseye	2:17.2.1-0+deb11u1	vulnerable
	bookworm	2:21.0.0-7	vulnerable
	trixie (security), trixie	2:26.0.3-0+deb13u2	vulnerable
	forky	2:28.0.1-1	vulnerable
	sid	2:28.0.1-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
neutron	source	(unstable)	2:28.0.1-2			1143170

Notes

https://security.openstack.org/ossa/OSSA-2026-032.html
https://bugs.launchpad.net/neutron/+bug/2152113

Home - Debian Security - Source (Git)

Apply commands

text fix

Notes

https://security.openstack.org/ossa/OSSA-2026-032.htmlhttps://bugs.launchpad.net/neutron/+bug/2152113

OS impact

Debian Mixed 5 releases

Version	Status	Fixed in
trixie	Affected	—
sid	Fixed	`2:28.0.1-2`
forky	Fixed	`2:28.0.1-2`
bullseye	Affected	—
bookworm	Affected	—

References

CWEs

CWE-863

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.