CVE-2025-59354 Dragonfly has weak integrity checks for downloaded files

Medium 5.5 Published 17 Sep 2025 Updated 18 Sep 2025

Attackers can replace downloaded files with malicious ones due to weak MD5 hash integrity checks in Dragonfly.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2025-59354?

CVE-2025-59354 is a medium-severity vulnerability in dragonflyoss dragonfly, published on 17 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Dragonfly is an open source P2P-based file distribution and image acceleration system. Prior to 2.1.0, the DragonFly2 uses a variety of hash functions, including the MD5 hash, for downloaded files. This allows attackers to replace files with malicious ones that have a colliding hash. This vulnerability is fixed in 2.1.0.

Weakness: CWE-328

Which versions are affected by CVE-2025-59354?

6 open source packages ship an affected version, including github.com/dragonflyoss/dragonfly and d7y.io/dragonfly/v2. It affects 1 product.

Package	Affected	Fixed in
`github.com/dragonflyoss/dragonfly` Go	All versions	None
`github.com/dragonflyoss/dragonfly` Go	All versions	`2.1.0`
`github.com/dragonflyoss/dragonfly` Go	All versions	`2.1.0`
`d7y.io/dragonfly/v2` Go	All versions	`2.1.0`
`d7y.io/dragonfly/v2` Go	All versions	`2.1.0`
`d7y.io/dragonfly/v2` Go	All versions	`2.1.0`

Products include Linuxfoundation Dragonfly.

How do I fix CVE-2025-59354?

Upgrade github.com/dragonflyoss/dragonfly to 2.1.0 or later.

Is CVE-2025-59354 being exploited?

There is no known exploitation of CVE-2025-59354 in the wild and no public exploit code.

Sources

Also known as GHSA-hx2h-vjw2-8r54, GO-2025-3973.