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

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-17 · updated 2026-06-17
Weakness: CWE-476

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.

Affected products

dragonflyoss dragonfly: before 2.1.0 — fixed in 2.1.0

How to fix

Upgrade to a fixed version: dragonflyoss dragonfly 2.1.0. Check the vendor advisory for mitigations.

References

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

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