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CISA Adds Ray AI Framework Flaw CVE-2025-62593 to KEV Catalog After Confirmed Exploitation

US authorities have issued a warning that a critical vulnerability in the Ray framework for scaling AI and Python applications is being actively exploited in real-world attacks. The flaw, tracked as CVE-2025-62593, allows remote code execution through browsers such as Firefox and Safari, potentially enabling attackers to run malicious code simply by displaying an ad on a compromised page. CISA added the issue to its Known Exploited Vulnerabilities catalog on August 17, 2026, and directed federal agencies to apply mitigations by August 20. Originally disclosed in November 2025 and fixed in Ray version 2.52.0, the vulnerability carries a CVSS v4.0 base score of 9.4 and is rated Critical. Developers using Ray in environments that also run Firefox or Safari face additional risk from DNS rebinding attacks that can lead to code injection. Organizations relying on Ray are urged to verify patch status and monitor for signs of compromise.

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US cybersecurity authorities have warned that a vulnerability in the Ray framework for scaling AI and Python applications is being actively exploited in the wild. The CISA added CVE-2025-62593 to its Known Exploited Vulnerabilities catalog on August 17, 2026, highlighting the risk of remote code execution via common web browsers.

The flaw affects Firefox and Safari and can be triggered when a user visits a page containing malicious advertisements. Attackers may combine the issue with DNS rebinding techniques to achieve code injection against Ray instances running in development environments. The vulnerability received a CVSS v4.0 base score of 9.4 and is rated Critical.

Ray version 2.52.0, released after the November 2025 disclosure, contains the fix. Proof-of-concept code has been publicly available, increasing the likelihood of further exploitation. CISA has instructed US federal agencies to implement mitigations no later than August 20, 2026.

Organizations that rely on Ray for distributed AI workloads are advised to confirm they are running the patched release and to review browser usage in development and test environments. The advisory underscores the expanding attack surface created when AI frameworks interact with standard web browsers.

FirefoxSafariRayCVE-2025-62593
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