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CRITICAL severity

OpenStack os-vif Ageing time of 0 disables linuxbridge MAC learningGHSA-mcpw-cp35-p3h8

CRITICALFix: openstack/os-vif@655c83d

GHSA-mcpw-cp35-p3h8 is a critical-severity (CVSS 9.1) CWE-770 vulnerability in os-vif. A fix is available for os-vif — see the affected versions and patch details below.

Also known asCVE-2019-15753PYSEC-2026-440
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs86th percentile — riskier than 86% of all scored CVEsHighest risk
0.47%1.35%2.23%3.11%1.0%2.6%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐍os-vif🐍os-vif

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

In OpenStack os-vif 1.15.x before 1.15.2, and 1.16.0, a hard-coded MAC aging time of 0 disables MAC learning in linuxbridge, forcing obligatory Ethernet flooding of non-local destinations, which both impedes network performance and allows users to possibly view the content of packets for instances belonging to other tenants sharing the same network. Only deployments using the linuxbridge backend are affected. This occurs in PyRoute2.add() in internal/command/ip/linux/impl_pyroute2.py.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIos-vif≥ 1.15.0&&< 1.15.21.15.2pip install --upgrade 'os-vif==1.15.2'
🐍PyPIos-vif≥ 1.16.0&&< 1.17.01.17.0pip install --upgrade 'os-vif==1.17.0'

Affected Products

1 product · 2 configurations
Application
os-vifopenstack
≥ 1.15.0 && < 1.15.2
1 version
1.16.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for os-vif, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update os-vif to 1.15.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mcpw-cp35-p3h8 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

In OpenStack os-vif 1.15.x before 1.15.2, and 1.16.0, a hard-coded MAC aging time of 0 disables MAC learning in linuxbridge, forcing obligatory Ethernet flooding of non-local destinations, which both impedes network performance and allows users to possibly view the content of packets for instances belonging to other tenants sharing the same network. Only deployments using the linuxbridge backend are affected. This occurs in PyRoute2.add() in `internal/command/ip/linux/impl_pyroute2.py`.
O3 Security · Impact-Aware SCA

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OpenStack os-vif Ageing time of 0 disables linuxbridge…