CVE-2026-116685
- Source
- https://cve.org/CVERecord?id=CVE-2026-116685
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-116685.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-116685
- Aliases
- Published
- 2026-10-27T19:26:46Z
- Modified
- 2026-10-29T02:48:26Z
- Severity
-
- 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
- Summary
- Model Context Protocol Python SDK: HTTP client transports followed cross-origin redirects carrying custom headers and bodies
- Details
-
The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients. From 1.8.0 until 1.30.0 and 2.2.0, streamable_http_client, streamablehttp_client, sse_client, ClientSessionGroup, OAuth, and create_mcp_http_client client paths enable follow_redirects and follow redirects to a different origin, forwarding caller-supplied custom credential headers and, for 307 or 308 responses, the request body. An attacker who can influence a trusted endpoint's redirect destination can receive that material. This issue is fixed in versions 1.30.0 and 2.2.0.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-200" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116685.json" }- References
-
- https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.30.0
- https://github.com/modelcontextprotocol/python-sdk/releases/tag/v2.2.0
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116685.json
- https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-5h93-6whr-6q8j
- https://nvd.nist.gov/vuln/detail/CVE-2026-116685
- https://github.com/modelcontextprotocol/python-sdk/commit/2106335745563b2321b8c73fef2c12903d00aa6e
- https://github.com/modelcontextprotocol/python-sdk/commit/c6762e821c527925f0b617db216d00fbd1d0bf99
- https://github.com/modelcontextprotocol/python-sdk/pull/3397
- https://github.com/modelcontextprotocol/python-sdk/pull/3448
Affected packages
Git / github.com/modelcontextprotocol/python-sdk
Affected ranges
- Type
- GIT
- Repo
- https://github.com/modelcontextprotocol/python-sdk
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "1.8.0" }, { "fixed": "1.30.0" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "introduced": "2.0.0" }, { "fixed": "2.2.0" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "fixed": "2106335745563b2321b8c73fef2c12903d00aa6e" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "c6762e821c527925f0b617db216d00fbd1d0bf99" } ], "source": "REFERENCES_COMMIT" }, { "original_tag": "v1.30.0", "range": [ { "fixed": "8c2fa6eabacde869d75568e33b9d466b58c2f512" } ], "source": "REFERENCES_TAG" }, { "original_tag": "v2.2.0", "range": [ { "fixed": "9972c21aa42054fb1450c5fc614761ed11847ec6" } ], "source": "REFERENCES_TAG" } ] }
Affected versions
1.*
1.15.0
v1.*
v1.10.0
v1.10.1
v1.11.0
v1.12.0
v1.12.1
v1.12.2
v1.12.3
v1.12.4
v1.13.0
v1.13.1
v1.14.0
v1.14.1
v1.15.0
v1.16.0
v1.17.0
v1.18.0
v1.19.0
v1.20.0
v1.21.0
v1.21.1
v1.22.0
v1.23.0
v1.23.1
v1.23.2
v1.23.3
v1.24.0
v1.25.0
v1.26.0
v1.27.0
v1.27.1
v1.27.2
v1.28.0
v1.28.1
v1.29.0
v1.29.1
v1.8.0
v1.8.1
v1.9.0
v1.9.1
v1.9.2
v1.9.3
v1.9.4
v2.*
v2.0.0
v2.1.0
v2.1.1