Traefik HTTP/2 connections management could cause a denial of serviceGHSA-c6hx-pjc3-7fqr
HIGHGHSA-c6hx-pjc3-7fqr is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in github.com/traefik/traefik/v2. A fix is available for github.com/traefik/traefik/v2 — see the affected versions and patch details below.
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-c6hx-pjc3-7fqr.
EPSS Exploitation Probability
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
github.com/traefik/traefik/v2🐹github.com/traefik/traefik/v2Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Impact
There is a potential vulnerability in Traefik managing HTTP/2 connections. A closing HTTP/2 server connection could hang forever because of a subsequent fatal error. This failure mode could be exploited to cause a denial of service.
Patches
Traefik v2.8.x: https://github.com/traefik/traefik/releases/tag/v2.8.8 Traefik v2.9.x: https://github.com/traefik/traefik/releases/tag/v2.9.0-rc5
Workarounds
No workaround.
For more information
If you have any questions or comments about this advisory, please open an issue.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/traefik/traefik/v2 | all versions | 2.8.8go get github.com/traefik/traefik/v2@v2.8.8 |
| 🐹Go | github.com/traefik/traefik/v2 | ≥ 2.9.0-rc1&&< 2.9.0-rc5 | 2.9.0-rc5go get github.com/traefik/traefik/v2@v2.9.0-rc5 |
Affected Products
traefiktraefikDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/traefik/traefik/v2, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/traefik/traefik/v2 to 2.8.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-c6hx-pjc3-7fqr 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-c6hx-pjc3-7fqr in your dependencies?
Find it across Go, including transitive dependencies.