How severe is CVE-2025-62593?

CVE-2025-62593 has a CVSS 4.0 base score of 9.4, rated critical severity.

Is CVE-2025-62593 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-62593?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-62593 have an EU (EUVD) identifier?

Yes. CVE-2025-62593 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199754.

When was CVE-2025-62593 published?

CVE-2025-62593 was published on 2025-11-26 and last updated on 2026-06-17.

CVE-2025-62593

CVE-2025-62593 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 4.0 base score 9.4)
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199754
Weakness: CWE-94
Published: 2025-11-26
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-62593?: 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.
How severe is CVE-2025-62593?: CVE-2025-62593 has a CVSS 4.0 base score of 9.4, rated critical severity.
Is CVE-2025-62593 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-62593?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-62593 have an EU (EUVD) identifier?: Yes. CVE-2025-62593 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199754.
When was CVE-2025-62593 published?: CVE-2025-62593 was published on 2025-11-26 and last updated on 2026-06-17.

References

Other CWE-94 (Code Injection) vulnerabilities

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CVE-2026-48836 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Easy Invoice <= 2.1.19 versions.

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