H3 is a minimal H(TTP) framework. In versions 2.0.0-0 through 2.0.1-rc.16, the `mount()` method in h3 uses a simple `startsWith()` check to determine whether incoming requests fall under a mounted sub-application's path prefix. Because this check does not verify a path segment boundary (i.e., that the next character after the base is `/` or end-of-string), middleware registered on a mount like `/admin` will also execute for unrelated routes such as `/admin-public`, `/administrator`, or `/adminstuff`.
This allows an attacker to trigger context-setting middleware on paths it was never intended to cover, potentially polluting request context with unintended privilege flags. Version 2.0.2-rc.17 contains a patch.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 16
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc1:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc10:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc11:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc12:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc13:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc14:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc15:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc16:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc2:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc3:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc4:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc5:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc6:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc7:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc8:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc9:*:*:*:node.js:*:*
|
— | — |