CVE-2026-54637
MediumCVSS 5.5Summary
In Dragonfly 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. These values are copied into resource.Host, and Peer.DownloadTinyFile() builds an HTTP GET request without destination validation, allowing read SSRF against loopback, link-local, and private services. DownPort is restricted to 1024-65534, and up to 128 bytes of the response can be placed in Task.DirectPiece.
Risk Assessment
A remote attacker can probe loopback, link-local, and private services and disclose internal network data. RFC1918 destinations remain reachable because IsGlobalUnicast accepts private ranges.
Recommendation
Update Dragonfly to version 2.4.4-rc.3, which blocks loopback and link-local targets, and consider further restricting access to private ranges.
Other vulnerabilities in Dragonfly
See all- CVE-2026-49254Low
Dragonfly prior to 2.4.4 registers GET /api/v1/oauth and GET /api/v1/oauth/:id without jwt.MiddlewareFunc() or RBAC(), while the handler returns models.Oauth records with client_secret exposed in JSON. When an administrator has configured a GitHub or Google OAuth provider, an unauthenticated network client can retrieve the provider's client secret, client identifier, and redirect URL.
- CVE-2026-62357High
Dragonfly before version 1.40.0 has a vulnerability in CMS.INITBYDIM and CMS.INITBYPROW commands where an arithmetic overflow in buffer size calculation leads to undersized buffer allocation. This allows an unauthenticated remote client to corrupt or disclose adjacent heap memory and crash the server.
Original NVD description (English source)
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.