# Open redirect in Phoenix.LiveView.validate_local_url!/2 via ASCII tab, LF and CR

Advisory record · `GHSA-36m4-rm57-3prf`

- **Identifiers:** `GHSA-36m4-rm57-3prf` · `CVE-2026-64941` · `EEF-CVE-2026-64941`
- **State:** Confirmed
- **Severity:** CVSS 2.1 Low
- **Critical:** No
- **Weakness (CWE):** [CWE-601](https://cwe.mitre.org/data/definitions/601.html)
- **Tags:** [Open redirect](https://agentprime.io/advisories/tag/open-redirect.md)
- **Published:** 10 Aug 2026
- **Updated:** 8 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 10 Aug 2026, 11:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `phoenix_live_view` (Hex): affected `>=0.5.0, <1.0.19 || >=1.1.0-rc.0, <1.1.33 || >=1.2.0-rc.0, <1.2.9`; fixed in `1.0.19`, `1.1.33`, `1.2.9`

## 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

- 2.1 Low, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`, from CNA (EEF)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0060, the 48th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:25 UTC: First seen by agentprime
- 31 Oct 2026, 15:25 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/EEF-CVE-2026-64941)

## Sources

- [GitHub Advisory Database: GHSA-36m4-rm57-3prf](https://github.com/advisories/GHSA-36m4-rm57-3prf)
- [OSV: GHSA-36m4-rm57-3prf](https://osv.dev/vulnerability/GHSA-36m4-rm57-3prf)
- <https://github.com/phoenixframework/phoenix_live_view/security/advisories/GHSA-36m4-rm57-3prf>
- <https://cna.erlef.org/cves/CVE-2026-64941.html>
- <https://github.com/phoenixframework/phoenix_live_view/commit/0b8c733133466912f81adecaea72b6712370242e>
- <https://github.com/phoenixframework/phoenix_live_view/commit/1c164f83df0bb922dfff9c60d125da5b0cfd6619>
- <https://github.com/phoenixframework/phoenix_live_view/commit/2068b304d71907064b159b6bc60c5ad85a876ecf>
- <https://hex.pm/packages/phoenix_live_view>

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 (<https://api.agentprime.io/mcp>), 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: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-36m4-rm57-3prf>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-36m4-rm57-3prf/>. Everything for agents: <https://agentprime.io/llms.txt>.