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CVE-2025-62593: Ray-Project Ray Code Injection Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-08-17
• EPSS: 60.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-11-26 · updated 2026-10-19
• Weakness: CWE-94

Description

Ray is an AI compute engine. Prior to version 2.52.0, developers working with Ray as a development tool can be exploited via a critical RCE vulnerability exploitable via Firefox and Safari. This vulnerability is due to an insufficient guard against browser-based attacks, as the current defense uses the User-Agent header starting with the string "Mozilla" as a defense mechanism. This defense is insufficient as the fetch specification allows the User-Agent header to be modified. Combined with a DNS rebinding attack against the browser, and this vulnerability is exploitable against a developer running Ray who inadvertently visits a malicious website, or is served a malicious advertisement (malvertising). This issue has been patched in version 2.52.0.

Affected products

• ray-project ray: before 2.52.0 — fixed in 2.52.0

How to fix

Upgrade to a fixed version: ray-project ray 2.52.0. Check the vendor advisory for mitigations.

References

• https://github.com/ray-project/ray/commit/70e7c72780bdec075dba6cad1afe0832772bfe09
• https://github.com/ray-project/ray/security/advisories/GHSA-q279-jhrf-cc6v
• https://www.bitsight.com/blog/rondodox-botnet-infrastructure-analysis
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-62593

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