Actively exploited · Published Nov 26, 2025 · Assigned by GitHub_M
CVE-2025-62593Ray is vulnerable to RCE via Safari & Firefox Browsers through DNS Rebinding Attack
Critical 9.4 Exploited
In plain English
A critical-severity code injection in ray from ray-project. Attackers are actively exploiting it in the wild (listed by CISA on August 17, 2026). The chance it is exploited in the next 30 days is estimated at 60.2% (higher than 99.1% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.
CISA guidance
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Federal agencies must remediate by Aug 20, 2026.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | ray | 2.52.0 | GHSA-q279-jhrf-cc6v |
| PyPI | ray | 2.52.0 | PYSEC-2026-520 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ray-project | ray | < 2.52.0 |
Weakness: CWE-94, CWE-352 · Vector: 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
References
- https://github.com/ray-project/ray/security/advisories/GHSA-q279-jhrf-cc6v x_refsource_CONFIRM
- https://github.com/ray-project/ray/commit/70e7c72780bdec075dba6cad1afe0832772bfe09 x_refsource_MISC
- https://www.bitsight.com/blog/rondodox-botnet-infrastructure-analysis third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-62593 government-resource