GHSA-vwq2-jx9q-9h9f is a critical-severity (CVSS 9.1) Server-Side Request Forgery (SSRF) vulnerability in github.com/charmbracelet/soft-serve. A fix is available for github.com/charmbracelet/soft-serve — see the affected versions and patch details below.
Soft Serve is vulnerable to SSRF through its Webhooks
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for GHSA-vwq2-jx9q-9h9f.
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-vwq2-jx9q-9h9f 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 376,715 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
github.com/charmbracelet/soft-serveReal-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
SUMMARY
We have identified and verified an SSRF vulnerability where webhook URLs are not validated, allowing repository administrators to create webhooks targeting internal services, private networks, and cloud metadata endpoints.
AFFECTED COMPONENTS (VERIFIED)
- Webhook Creation (pkg/ssh/cmd/webhooks.go:125)
- Backend CreateWebhook (pkg/backend/webhooks.go:17)
- Backend UpdateWebhook (pkg/backend/webhooks.go:122)
- Webhook Delivery (pkg/webhook/webhook.go:97)
IMPACT
This vulnerability allows repository administrators to perform SSRF attacks, potentially enabling:
a) Cloud Metadata Theft - Access AWS/Azure/GCP credentials via 169.254.169.254 b) Internal Network Access - Target localhost and private networks (10.x, 192.168.x, 172.16.x) c) Port Scanning - Enumerate internal services via response codes and timing d) Data Exfiltration - Full HTTP responses stored in webhook delivery logs e) Internal API Access - Call internal admin panels and Kubernetes endpoints
PROOF OF CONCEPT
Simple example demonstrating localhost access:
ssh localhost webhook create my-repo http://127.0.0.1:8080/internal \
--events push --active
then push to trigger.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/charmbracelet/soft-serve | all versions | 0.11.1go get github.com/charmbracelet/soft-serve@v0.11.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/charmbracelet/soft-serve, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/charmbracelet/soft-serve to 0.11.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-vwq2-jx9q-9h9f 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-vwq2-jx9q-9h9f can be triaged on real exposure rather than presence alone.
Tailored to GHSA-vwq2-jx9q-9h9f. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-vwq2-jx9q-9h9f in your dependencies?
O3 Security finds GHSA-vwq2-jx9q-9h9f across Go dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.