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Tue, 22 Sep 2026 19:30:00 +0000
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ssvc
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Tue, 22 Sep 2026 18:15:00 +0000
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| Description | MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_url_for_ssrf checks a hostname's resolved addresses, but Requests and urllib3 resolve the hostname again when connecting. A caller can use a short-lived DNS answer that is public during validation and private during connection, preserving unauthenticated access to internal or metadata endpoints despite the earlier CVE-2026-27826 remediation. The advisory traces the vulnerable input and processing flow through validate_url_for_ssrf, _check_dns_resolution, socket.getaddrinfo, and _make_ssrf_safe_hook, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0. | |
| Title | MCP Atlassian: Incomplete fix for CVE-2026-27826: DNS rebinding bypasses SSRF validation (validated IP not pinned) | |
| Weaknesses | CWE-367 CWE-918 |
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cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-09-22T18:49:13.059Z
Reserved: 2026-08-20T19:02:23.415Z
Link: CVE-2026-77242
Updated: 2026-09-22T18:49:05.395Z
Status : Received
Published: 2026-09-22T18:17:16.430
Modified: 2026-09-22T19:16:48.503
Link: CVE-2026-77242
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OpenCVE Enrichment
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