GHSA-8x5v-cpv7-8jjp is a high-severity (CVSS 7.1) Server-Side Request Forgery (SSRF) vulnerability in open-webui. A fix is available for open-webui — see the affected versions and patch details below.
Open WebUI: Any authenticated user can reach internal services and cloud metadata via NAT64-encoded URLs
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-8x5v-cpv7-8jjp.
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-8x5v-cpv7-8jjp 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
open-webuiReal-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
Summary
Open WebUI fetches user-supplied URLs on the server for RAG URL ingestion, URL-to-markdown conversion and web-search content retrieval, and decides whether a destination is allowed by asking whether its IP address is globally routable. That test operates on the literal IPv6 address and does not look at the IPv4 address embedded inside it. On a deployment whose network has a NAT64 gateway, any verified user can wrap an internal or cloud-metadata IPv4 address in the NAT64 well-known prefix, pass the filter, and receive the internal response body back through the API.
Preconditions
- Any verified (authenticated) user account. No admin role, no elevated permission.
- Default configuration:
ENABLE_LOCAL_WEB_FETCHoff, the defaultWEB_FETCH_FILTER_LISTmetadata blocklist in place. Neither prevents this, because the blocklist matches hostname strings and the NAT64 literal is not one of them. - The deployment's network must provide NAT64 translation for the well-known
64:ff9b::/96prefix, which is the common default on IPv6-only and dual-stack cloud and Kubernetes networks. - Deployments on IPv4-only networks, or on any network without a NAT64 gateway, are not affected: the address has nowhere to route.
Impact
On an affected network a low-privilege user can read GET responses from services the server can reach but the internet cannot: cloud instance metadata including IAM role credentials, loopback-bound admin surfaces, and internal APIs in the same VPC or cluster. The response body is returned to the caller, so this is full-read, not blind. Exploitation is not universal, it depends entirely on the deployment's network providing NAT64 translation, which is why the score carries high attack complexity. Deployments without NAT64 lose nothing here.
Fix
Fixed in v0.11.0 by commit 1717b493d. Address classification now unwraps the IPv4 embedded in IPv6 transition encodings before deciding whether a destination is global, and applies that at all three checkpoints. NAT64-wrapped public destinations continue to work. Upgrading to v0.11.0 fully resolves the issue with no configuration change.
Root cause
backend/open_webui/retrieval/web/utils.py—validate_url(), the pre-fetch check on the submitted URL.backend/open_webui/retrieval/web/utils.py—_ssrf_safe_new_conn()and_SSRFSafeResolver, the connect-time re-checks that defeat DNS rebinding.
All three decided reachability from ipaddress.ip_address(ip).is_global applied to the literal address. That predicate answers whether an IPv6 address sits in globally-routable space, which is a different question from where the packet actually ends up once a transition gateway translates it. The NAT64 well-known prefix is by design a global prefix carrying an arbitrary IPv4 destination, so an internal target wrapped in it satisfies the check while reaching exactly what the check exists to prevent. Because the same predicate backed the connect-time re-checks, no later layer caught it either. The fix inspects every standardized transition encoding rather than only the NAT64 prefix, since the same reasoning error applies to each of them.
Proof of concept
Against the real POST /api/v1/retrieval/process/web flow on v0.10.2 as an authenticated user, with internal HTTP services returning a marker string. The plain forms are rejected with HTTP 400:
http://169.254.169.254/latest/meta-data/ -> 400
http://127.0.0.1/ -> 400
http://[::ffff:169.254.169.254]/ -> 400
http://metadata.google.internal/ -> 400
The NAT64 encodings of the same targets are accepted, and the response body is returned in the content field:
http://[64:ff9b::a9fe:a9fe]/latest/meta-data/iam/security-credentials/ -> 200, marker returned
http://[64:ff9b::7f00:1]/admin/internal-status -> 200, marker returned
NAT64 translation was modelled by binding the translated addresses locally rather than by routing through a real NAT64 gateway; everything else, including the request flow and the validation code, is the unmodified v0.10.2 path. After the fix both URLs return 400 while http://[64:ff9b::808:808]/ (8.8.8.8, public) still returns 200, confirming no over-blocking.
Credits
- tonghuaroot — reported the transition-form gap in the address classification and supplied the fix approach.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | open-webui | ≥ 0.9.0&&< 0.11.0 | 0.11.0pip install --upgrade 'open-webui==0.11.0' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for open-webui, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update open-webui to 0.11.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8x5v-cpv7-8jjp 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-8x5v-cpv7-8jjp can be triaged on real exposure rather than presence alone.
Tailored to GHSA-8x5v-cpv7-8jjp. 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-8x5v-cpv7-8jjp in your dependencies?
O3 Security finds GHSA-8x5v-cpv7-8jjp across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.