dragonflyoss Dragonfly up to 2.4.4-rc.2 Scheduler peer.go Peer.DownloadTinyFile server-side request forgery

Summaryinfo

A vulnerability, which was classified as problematic, has been found in dragonflyoss Dragonfly up to 2.4.4-rc.2. This impacts the function Peer.DownloadTinyFile of the file scheduler/resource/standard/peer.go of the component Scheduler. The manipulation leads to server-side request forgery. This vulnerability is uniquely identified as CVE-2026-54637. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in dragonflyoss Dragonfly up to 2.4.4-rc.2. This issue affects the function Peer.DownloadTinyFile of the file scheduler/resource/standard/peer.go of the component Scheduler. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality. The summary by CVE is:

Dragonfly is an open source P2P-based file distribution and image acceleration system. Prior to 2.4.4-rc.3, the scheduler's default unauthenticated v1 gRPC flow accepts attacker-controlled PeerHost.Ip and PeerHost.DownPort values through RegisterPeerTask and ReportPeerResult, storeHost copies those values into resource.Host, and handlePeerSuccess invokes Peer.DownloadTinyFile() for a TINY task. DownloadTinyFile() in scheduler/resource/standard/peer.go builds an HTTP GET request from the supplied address without destination validation, allowing a remote attacker to probe loopback, link-local, and private services and place up to TinyFileSize, 128 bytes, of a response in Task.DirectPiece for later retrieval. PeerHost.DownPort is restricted to ports 1024 through 65534, and the issue provides read SSRF rather than remote code execution. The remediation blocks loopback and link-local targets, while RFC1918 destinations remain reachable because IsGlobalUnicast accepts private ranges. This issue is fixed in 2.4.4-rc.3.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-54637 since 06/15/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

It is declared as proof-of-concept.

Upgrading to version 2.4.4-rc.3 eliminates this vulnerability.

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Productinfo

Vendor

• dragonflyoss

Name

• Dragonfly

Version

• 2.4.4-rc.0
• 2.4.4-rc.1
• 2.4.4-rc.2

Website

• Product: https://github.com/dragonflyoss/dragonfly/

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