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CVE-2026-33490

20
FAUCET Score

CVE-2026-33490 is a vulnerability in the H3 framework (versions 2.0.0-0 through 2.0.1-rc.16) where the `mount()` method's path prefix check is insufficient. This allows middleware intended for specific sub-application paths (e.g., `/admin`) to execute for unrelated routes (e.g., `/admin-public`), potentially leading to request context pollution with unintended privilege flags. Rated Medium with a CVSS score of 5.3, it has a network attack vector and low attack complexity, primarily impacting integrity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
2.0.1CPE matchmatch criteria
cpe:2.3:a:h3:h3:2.0.1:rc1:*:*:*:node.js:*:*
2.0.1CPE matchmatch criteria
cpe:2.3:a:h3:h3:2.0.1:rc10:*:*:*:node.js:*:*
2.0.1CPE matchmatch criteria
cpe:2.3:a:h3:h3:2.0.1:rc11:*:*:*:node.js:*:*
2.0.1CPE matchmatch criteria
cpe:2.3:a:h3:h3:2.0.1:rc12:*:*:*:node.js:*:*
2.0.1CPE matchmatch criteria
cpe:2.3:a:h3:h3:2.0.1:rc13:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

3.7LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.24%
Probability of exploitation in next 30 days
EPSS Percentile
15.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0024 is in the 6th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

npmpatch availablevia ghsa
Product: h3Fixed in: 2.0.1-rc.17
github_advisoryworkaround availablevia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-2j6q-whv2-gh6wlow

h3: Missing Path Segment Boundary Check in `mount()` Causes Middleware Execution on Unrelated Prefix-Matching Routes

Mar 20, 2026

References

github.com / h3js/h3/security/advisories/GHSA-2j6q-whv2-gh6w
ExploitMitigationVendor Advisory