GHSA-rrc9-mx66-ffcm — daphne
MEDIUMGHSA-rrc9-mx66-ffcm is a medium-severity (CVSS 5.3) CWE-770 vulnerability in daphne. A fix is available for daphne — see the affected versions and patch details below.
daphne: Unauthenticated attackers can cause excessive memory consumption by sending arbitrarily large WebSocket messages/frames
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-rrc9-mx66-ffcm.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-rrc9-mx66-ffcm plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 379,145 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
daphneReal-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
daphne before 4.2.2 did not pass maxFramePayloadSize or maxMessagePayloadSize to Autobahn's WebSocketServerFactory. Because Autobahn defaults both values to 0 (unlimited), an unauthenticated remote attacker could send arbitrarily large WebSocket messages or frames, causing excessive memory consumption and a denial of service.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | daphne | all versions | 4.2.2pip install --upgrade 'daphne==4.2.2' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for daphne, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update daphne to 4.2.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-rrc9-mx66-ffcm is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-rrc9-mx66-ffcm can be triaged on real exposure rather than presence alone.
Tailored to GHSA-rrc9-mx66-ffcm. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Ansible Automation Platform 2.5 for RHEL 8 | python3.12-daphne-0:4.2.2-1.el8ap | RHSA-2026:50319 |
| Red Hat Ansible Automation Platform 2.6 for RHEL 9 | python3.12-daphne-0:4.2.2-1.el9ap | RHSA-2026:50336 |
| Red Hat Ansible Automation Platform 2.6 for RHEL 9 | automation-controller-0:4.7.16-1.el9ap | RHSA-2026:59136 |
| Red Hat Ansible Automation Platform 2.5 | ansible-automation-platform-25/lightspeed-rhel8:1785430174 | RHSA-2026:50357 |
| Red Hat Ansible Automation Platform 2.6 | ansible-automation-platform-26/eda-controller-rhel9:1785633038 | RHSA-2026:50479 |
| Red Hat Ansible Automation Platform 2.6 | ansible-automation-platform-26/controller-rhel9:1787244009 | RHSA-2026:59155 |
| Red Hat Ansible Automation Platform 2.7 | ansible-automation-platform-27/eda-controller-rhel9:1785374869 | RHSA-2026:50340 |
| Red Hat Ansible Automation Platform 2.7 | ansible-automation-platform-27/controller-rhel9:1787220257 | RHSA-2026:59153 |
Frequently Asked Questions
Is GHSA-rrc9-mx66-ffcm in your dependencies?
O3 Security finds GHSA-rrc9-mx66-ffcm across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.