CVE-2025-64522 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 CVE-2025-64522.
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/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 |
Affected Products
soft servecharmDetection & 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 CVE-2025-64522 is resolved across your whole dependency graph.
Workarounds
Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.
Frequently Asked Questions
Is CVE-2025-64522 in your dependencies?
Find it across Go, including transitive dependencies.