# CVE-2025-62593 — ray-project ray **CISA KEV** > As of 2026-08-18, CVE-2025-62593 is a HIGH-severity vulnerability in ray-project ray, CVSS v3.1 8.8, EPSS 1.0% (60.6th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-08-17), with a US federal remediation deadline of 2026-08-20. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2025-62593, most recently “CISA Warns of Active Exploitation of Ray-Project Ray Code Injection Vulnerability (CVE-2025-62593) by RondoDox Botnet”. **Last updated:** 2026-08-18 ## 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. The record classifies CVE-2025-62593 under weakness classes [CWE-94](https://cwe.mitre.org/data/definitions/94.html), [CWE-352](https://cwe.mitre.org/data/definitions/352.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 291 days ago. ## Severity and exploitation probability - **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`) - **CVSS v4.0 base score:** 9.4 (`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`) - **EPSS (FIRST):** 1.0% probability of exploitation in the next 30 days, higher than 60.6% of all scored CVEs - **CISA KEV:** Listed since 2026-08-17, federal remediation deadline 2026-08-20 - **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9 - **Published:** 2025-11-26, last modified 2026-08-18 ## Is CVE-2025-62593 being exploited? CISA added CVE-2025-62593 to the Known Exploited Vulnerabilities catalog on 2026-08-17, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-08-20 under BOD 22-01. Weaponised exploit code for CVE-2025-62593 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 33 in the Threadlinqs vulnerability feed. - [Boreas37/CVE-2025-62593-PoC](https://github.com/Boreas37/CVE-2025-62593-PoC) (github) - [trickest/cve](https://github.com/trickest/cve/blob/main/2025/CVE-2025-62593.md) (trickest) ## Affected products and versions - **ray-project**: ray Affected software packages: - `pip:ray` — patched in 2.52.0 ## How to fix CVE-2025-62593 The record marks a vendor fix as available for CVE-2025-62593. Fixed versions are recorded for 1 package: pip:ray 2.52.0. Patch reference: [https://github.com/ray-project/ray/commit/70e7c72780bdec075dba6cad1afe0832772bfe09](https://github.com/ray-project/ray/commit/70e7c72780bdec075dba6cad1afe0832772bfe09). Vendor advisory: [https://github.com/ray-project/ray/security/advisories/GHSA-q279-jhrf-cc6v](https://github.com/ray-project/ray/security/advisories/GHSA-q279-jhrf-cc6v). Because CVE-2025-62593 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-08-20. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory. ## Threat activity tracking CVE-2025-62593 1 tracked threat in the Threadlinqs corpus references CVE-2025-62593, either in the campaign’s CVE list or as an indicator on the campaign record. - [CISA Warns of Active Exploitation of Ray-Project Ray Code Injection Vulnerability (CVE-2025-62593) by RondoDox Botnet](https://intel.threadlinqs.com/threat/TL-2026-2097) — CRITICAL · 2026-08-21 ## Sources Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-08-21. This product uses the NVD API but is not endorsed or certified by the NVD. **Vendor advisory and patch** - [github.com](https://github.com/ray-project/ray/security/advisories/GHSA-q279-jhrf-cc6v) **Other references** - [github.com](https://github.com/ray-project/ray/commit/70e7c72780bdec075dba6cad1afe0832772bfe09) Canonical: https://intel.threadlinqs.com/cve/CVE-2025-62593 Full detection coverage and IOCs for threats exploiting CVE-2025-62593 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp