GHSA-489g-7rxv-6c8q

### Summary GHSA-7r34-79r5-rcc9's fix added `validate_url_for_ssrf`, which resolves the attacker-controlled `X-Atlassian-{Jira,Confluence}-Url` header host **once at middleware time** and trusts the result. But the outbound request is later built with the **raw hostname** and **re-resolves at connect time with no IP pinning**. An attacker-controlled rebinding DNS name returns a public IP on the guard's lookup (validation passes) and `169.254.169.254` / an internal IP on the request's lookup (the socket connects there) → unauthenticated SSRF to cloud metadata / internal services on the **patched** build. ### Relationship to CVE-2026-27826 / GHSA-7r34-79r5-rcc9 (incomplete fix — please read first) This is an **incomplete-fix sibling** of the published `GHSA-7r34-79r5-rcc9` (the `X-Atlassian-*-Url` header SSRF). That fix (PR #986/#1005) added a single middleware-time resolve + allowlist DNS-skip, but **does not pin the validated IP to the connection** — the fetcher re-resolves the raw hostname at connect time, so the documented SSRF mitigation is incomplete against DNS-rebinding. The other advisory `GHSA-xjgw-4wvw-rgm4` (file-write) is unrelated. Verified live (2026-06-27): neither advisory, nor any open PR/issue (`rebind`/`TOCTOU`/`getaddrinfo`/`pin` → 0), covers connect-time re-resolution. Filing as an incomplete-fix of GHSA-7r34 (not a standalone fresh SSRF). ### Affected `src/mcp_atlassian/utils/urls.py` + `servers/main.py` + `servers/dependencies.py`, HEAD `ba72540` (PyPI `mcp-atlassian`, patched ≥0.17.0). **CWE-918** (SSRF) via **CWE-367** (TOCTOU). ### Vulnerable code `utils/urls.py` `validate_url_for_ssrf` (≈184-205) resolves + validates, then returns a **string verdict, not a pinned IP**: ```python def validate_url_for_ssrf(url: str) -> str | None: # returns an error string or None — NO IP is pinned ... # resolves the host, checks each resolved IP is global, then DISCARDS the IP ``` `servers/main.py:526,534` calls it once in middleware. `servers/d