CVE-2026-33490Disclosure(h3 / h3)

LOWCVSS 5.3 · MEDIUM

Signal is active with 2 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

h3 CVEs Back to dashboard

0.0/ 10 priority

Sources & remediation

Exploit / PoC references

Weakness type (CWE)

CWE-706

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

Threat summary

2 mentions across 1 observed day

What's happening

Technical details provided in 2 signals
Disclosure: 2 classified signals
2 total mentions across 1 day

Affected systems

Vendors

Products

1 version affected across 1 product

Deep dive

Activity timeline2 mentions / 1d

Signal classification1 categories

Disclosure

2100.0%

Referenced assets2 URLs

By indicator

Full discourse2 posts

Infoflowcloud@infoflowcloud197d
Disclosure
🚨*CVE* CVE-2026-33490 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… https://www.cve.org/CVERecord?id=CVE-2026-33490 ----- Traducción: CVE-2026-33490 H3 … http://infoflow.cloud`
Post summary
The entry announces CVE‑2026‑33490, describing a vulnerability in the H3 framework's `mount()` method that relies on a simple `startsWith()` check.
0000030
65 followersView on X
CVE@CVEnew197d
Disclosure
CVE-2026-33490 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… https://www.cve.org/CVERecord?id=CVE-2026-33490
Post summary
The text announces CVE-2026-33490 affecting the H3 framework, noting a vulnerable startsWith check in the mount() method, with no patch or exploit detail.
00000190
56.9K followersView on X

CPE platform detail16 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

16 of 16 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-
App	h3	h3	2.0.1	node.js	-

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