# TsDProxy: X-Forwarded-For header injection allows IP spoofing in proxied requests to backend services Advisory record · `GHSA-pqg7-v6wh-3pfp` - **Identifiers:** `GHSA-pqg7-v6wh-3pfp` · `GO-2026-5982` - **State:** Confirmed - **Severity:** CVSS 8.5 High - **Critical:** No - **Weakness (CWE):** [CWE-74](https://cwe.mitre.org/data/definitions/74.html) - **Tags:** [Other injection](https://agentprime.io/advisories/tag/injection.md) - **Published:** 14 Jul 2026 - **Updated:** 21 Jul 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 14 Jul 2026, 19:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `github.com/almeidapaulopt/tsdproxy` (Go): affected `all versions`; no fixed version yet ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Versions of github.com/almeidapaulopt/tsdproxy are affected, and no fixed version is listed. The proxy does not remove incoming X-Forwarded-For or X-Real-IP headers before forwarding requests to backend services, so an authenticated Tailscale user can set these headers to arbitrary values. A user with regular access could then bypass IP-based restrictions, rate limits, or audit logging on backends that trust those headers. No workaround is given in the source. Written 6 Nov 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 8.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N`, from GitHub Advisory Database - **CISA KEV:** Not listed. - **EPSS:** No score. ## Timeline - 31 Oct 2026, 14:58 UTC: First seen by agentprime - 31 Oct 2026, 14:58 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-pqg7-v6wh-3pfp) ## Sources - [GitHub Advisory Database: GHSA-pqg7-v6wh-3pfp](https://github.com/advisories/GHSA-pqg7-v6wh-3pfp) - [OSV: GHSA-pqg7-v6wh-3pfp](https://osv.dev/vulnerability/GHSA-pqg7-v6wh-3pfp) - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .