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Advisory record · GHSA-q279-jhrf-cc6v

Ray is vulnerable to Critical RCE via Safari & Firefox Browsers through DNS Rebinding Attack

CVSS 9.4 CriticalCriticalIn CISA KEVEPSS 0.60 · 99th percentile

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

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.

PackageEcosystemAffectedFixed in
rayPyPI<2.52.02.52.0
Identifiers
GHSA-q279-jhrf-cc6v · CVE-2025-62593 · PYSEC-2026-520
Weakness (CWE)
CWE-94 · CWE-352
Tags
Published
26 Nov 2025
Updated
10 Sept 2026

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

ScoreRatingCVSSVectorSource
9.4 Critical 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 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

  1. 31 Oct 2026, 14:11 UTC First seen by agentprime
  2. 31 Oct 2026, 14:11 UTC Confirmed by OSV

Sources

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.