Security Digest · Vulnerability record
CVE-2025-64522: Soft Serve is vulnerable to SSRF through its Webhooks
Soft Serve is a self-hostable Git server for the command line.
CVSS 9.1 Critical EPSS 0.4% · p29
Should you act?
Critical, preconditions apply
Severe if exploited, but exploitation needs conditions that may not apply to you. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Not in CISA KEV, but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.4%, percentile 29: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 29% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes
github.com/charmbracelet/soft-serve(Go) < 0.11.1, fixed in 0.11.1. Check your lockfile, including transitive dependencies.
What it is
Soft Serve is a self-hostable Git server for the command line. Versions prior to 0.11.1 have a SSRF vulnerability where webhook URLs are not validated, allowing repository administrators to create webhooks targeting internal services, private networks, and cloud metadata endpoints. Version 0.11.1 fixes the vulnerability.
From the GitHub advisory
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)
1. Webhook Creation (pkg/ssh/cmd/webhooks.go:125) 2. Backend CreateWebhook (pkg/backend/webhooks.go:17) 3. Backend UpdateWebhook (pkg/backend/webhooks.go:122) 4. Webhook Delivery (pkg/webhook/webhook.go:97)
IMPACT
Weakness type: CWE-918.
Product: github.com/charmbracelet/soft-serve (Go) · Assigned by: GitHub_M · Published: 2025-11-10
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| Go | github.com/charmbracelet/soft-serve | < 0.11.1 | 0.11.1 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| charmbracelet | soft-serve | < 0.11.1 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_M | 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L |
| GitHub | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: low (any account)
- User interaction: none
- Scope: changed (can affect other components)
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc, automatable no, technical impact partial.
- FIRST EPSS (model of 2026-10-21): 0.37% probability of exploitation activity in the next 30 days; percentile 29.
Timeline
- — CVE record published by GitHub_M
- — GitHub-reviewed advisory GHSA-vwq2-jx9q-9h9f published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-vwq2-jx9q-9h9f github.com
- CVE.org record CVE-2025-64522 cve.org
- NVD entry CVE-2025-64522 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com
- github.com github.com
- github.com github.com