Server-side Request Forgery (SSRF) Affecting open-webui package, versions [0.3.31, 0.9.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-OPENWEBUI-16735448
- published18 May 2026
- disclosed14 May 2026
- creditdkonis, wlayzz
Introduced: 14 May 2026
NewCVE-2026-45331 (opens in a new tab)How to fix?
Upgrade open-webui to version 0.9.0 or higher.
Overview
open-webui is an Open WebUI
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) through the validate_url function in the URL validation component. An attacker can bypass private-address checks by supplying a hostname that resolves to a private IPv6 address, causing the loader to accept URLs that point at loopback, link-local, or other non-public targets.
Notes
- The vulnerable check runs on every code path that calls
validate_url(), so the same SSRF bypass applies beyond the web-search flow the advisory highlights; the maintainer note names/api/v1/retrieval/process/weband/api/v1/images/editas examples of callers. - The bypass is broader than plain private IPv6: IPv4-mapped IPv6 literals and several non-global IPv4 ranges also slip past the validator-based filtering, so deployments that only expected to block RFC1918 space can still be exposed to metadata, loopback, and other reserved targets.