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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-55602

34
FAUCET Score

http-proxy-middleware is node.js http-proxy middleware. From 0.16.0 until 2.0.10, 3.0.6, and 4.1.0, http-proxy-middleware documents router proxy-table entries as host, path, or host+path selectors, but the host+path implementation uses unanchored substring matching on attacker-controlled request metadata. As a result, a crafted Host header that is only a superstring match for a configured host+path key can still route a request to an unintended backend. This vulnerability is fixed in 2.0.10, 3.0.6, and 4.1.0.

First published: Jun 22, 2026Last modified: Jun 22, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.16.0, < 2.0.10CPE matchmatch criteria
cpe:2.3:a:chimurai:http-proxy-middleware:*:*:*:*:*:*:*:*
>= 3.0.0, < 3.0.6CPE matchmatch criteria
cpe:2.3:a:chimurai:http-proxy-middleware:*:*:*:*:*:*:*:*
>= 4.0.0, < 4.1.0CPE matchmatch criteria
cpe:2.3:a:chimurai:http-proxy-middleware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

6.9MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
LOW
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 10th percentile among its peer group of 51,485 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

npmpatch availablevia ghsa
Product: http-proxy-middlewareFixed in: 4.1.0
npmpatch availablevia ghsa
Product: http-proxy-middlewareFixed in: 3.0.6
npmpatch availablevia ghsa
Product: http-proxy-middlewareFixed in: 2.0.10

Vendor Advisories (1)

npmGHSA-64mm-vxmg-q3vjmedium

http-proxy-middleware `router` host+path substring matching allows Host-header-driven backend routing bypass

Jun 18, 2026

References

github.com / chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-vxmg-q3vj
ExploitVendor Advisory