Ray is vulnerable to RCE via Safari & Firefox Browsers through DNS Rebinding Attack
Affects Ray versions before 2.52.0 for developers running Ray locally when the browser is Firefox or Safari; Chrome is not affected. Fixed in Ray 2.52.0.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 2.52.0
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: active
- Automatable: yes
- Technical impact: total
Summary
Ray, an AI compute engine used by developers as a development tool, is affected through its browser-facing protections, which can be bypassed when a developer uses Firefox or Safari. The impact is that an attacker could run arbitrary code on a developer's machine if the developer visits a malicious website or sees a malicious advertisement.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original 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.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA SSVC assessment
Exploitation: active · Automatable: yes · Technical impact: total
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- ray-project ray
fixed in 2.52.0
- rayPyPI
fixed in 2.52.0
References 2
GitHub · ray-project/ray
Questions about CVE-2025-62593
What does this mean?
A DNS rebinding attack against a Firefox or Safari browser can lead to arbitrary shell commands running on the developer's machine where Ray is running, which is remote code execution. The attack requires the browser to be pointed at the developer's local Ray instance.Source: github.com
Am I affected, and how do I check?
Ray versions before 2.52.0 are in scope, and the risk applies when Ray is used as a local development tool and the browser in use is Firefox or Safari (Chrome is not vulnerable). To check the installed version, run `ray --version` or `python -c "import ray; print(ray.__version__)"`.Source: github.com
What should I do about it?
Update Ray to version 2.52.0 or higher, which is the fixed release named in the advisory.Source: github.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-08-17, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data