# Ray is vulnerable to Critical RCE via Safari & Firefox Browsers through DNS Rebinding Attack Advisory record · `GHSA-q279-jhrf-cc6v` - **Identifiers:** `GHSA-q279-jhrf-cc6v` · `CVE-2025-62593` · `PYSEC-2026-520` - **State:** Confirmed - **Severity:** CVSS 9.4 Critical - **Critical:** Yes: KEV, CVSS 9+, CVSS 7+ and EPSS - **Weakness (CWE):** [CWE-94](https://cwe.mitre.org/data/definitions/94.html) · [CWE-352](https://cwe.mitre.org/data/definitions/352.html) - **Tags:** [Code injection](https://agentprime.io/advisories/tag/code-injection.md) · [Cross-site request forgery (CSRF)](https://agentprime.io/advisories/tag/csrf.md) - **Published:** 26 Nov 2025 - **Updated:** 10 Sept 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 26 Nov 2025, 19:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Critical Critical, because: - In CISA’s KEV catalogue since 17 Aug 2026: it is known to be exploited. - CVSS score 9.4: 9.0 or more. - CVSS score 9.4 (7.0 or more) and EPSS 0.60 (0.1 or more): a high score and a real chance of exploitation in the next 30 days. How we decide what’s critical: ## Affected packages - `ray` (PyPI): affected `<2.52.0`; fixed in `2.52.0` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Ray versions before 2.52.0 are vulnerable to remote code execution from a web browser. An attacker can use DNS rebinding in Firefox or Safari, triggered when a developer visits a malicious site or ad, to run arbitrary shell commands on the developer's machine through Ray's jobs API. Upgrade to Ray 2.52.0 or later, which also adds an optional token authentication feature. Written 1 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 - 9.4 Critical, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`, from CNA (GitHub_M) - **CISA KEV:** Listed since 17 Aug 2026: known to be exploited. - **EPSS:** 0.60, the 99th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 14:11 UTC: First seen by agentprime - 31 Oct 2026, 14:11 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-q279-jhrf-cc6v) ## Sources - [GitHub Advisory Database: GHSA-q279-jhrf-cc6v](https://github.com/advisories/GHSA-q279-jhrf-cc6v) - [OSV: GHSA-q279-jhrf-cc6v](https://osv.dev/vulnerability/GHSA-q279-jhrf-cc6v) - - - - - - - - - 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: .