GHSA-mpf2-q34c-fc6j is a high-severity (CVSS 7.5) CWE-835 vulnerability in scapy. 1 public exploit reference exists, so weaponization risk is real. A fix is available for scapy — see the affected versions and patch details below.
Infinite Loop in scapy
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
GHSA-mpf2-q34c-fc6j by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 379,842 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
scapyReal-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
scapy is affected by a Denial of Service vulnerability resulting in an infinite loop and resource consumption rendering the program unresponsive. The component is: _RADIUSAttrPacketListField.getfield(self..). The attack vector is over the network or in a pcap. both work.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | scapy | ≥ 2.4-rc1&&< 2.4.1 | 2.4.1pip install --upgrade 'scapy==2.4.1' |
Affected Products
fedorafedoraprojectscapyscapyResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for scapy, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update scapy to 2.4.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mpf2-q34c-fc6j is resolved across your whole dependency graph.
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
Is GHSA-mpf2-q34c-fc6j in your dependencies?
Find it across PyPI, including transitive dependencies.