CVE-2026-55603

CVE-2026-55603 affects http-proxy-middleware (Node.js). In versions 3.0.4–3.0.7 and 4.1.1, fixRequestBody() rebuilds multipart/form-data by interpolating req.body into the wire format without neutralizing CR/LF. This can let an attacker inject a new multipart part (via unescaped CRLF in keys/valu...

CVE-2026-55603 http-proxy-middleware: multipart/form-data field injection via unescaped CRLF in `fixRequestBody`

http-proxy-middleware is node.js http-proxy middleware. From 3.0.4 until 3.0.7 and 4.1.1, fixRequestBody is the library's documented helper for re-emitting a request body that was already consumed by a body parser. When the outgoing Content-Type is multipart/form-data, it rebuilds the body with...

CVE-2026-55602

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...

CVE-2026-55602

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...

CVE-2026-55602

The CVE-2026-55602 issue affects http-proxy-middleware (Node.js) versions 0.16.0 through 2.0.10, 3.0.6, and 4.1.0. The host+path router uses unanchored substring matching on attacker-controlled request metadata, enabling a crafted Host header that is a superstring match for a configured key to ro...

CVE-2026-55602 http-proxy-middleware `router` host+path substring matching allows Host-header-driven backend routing bypass

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...

EUVD-2026-38300

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...

CVE-2026-55602 http-proxy-middleware `router` host+path substring matching allows Host-header-driven backend routing bypass

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...

@angular-devkit/build-angular (22.1.0-next.0), @oslokommune/auth-bff (>=2.0.1, <=2.2.1) +1 more potentially affected by CVE-2026-55603 via http-proxy-middleware (>=4.0.0, <=4.1.0)

http-proxy-middleware NPM version =4.0.0, =2.0.1, =8.6.0, =8.8.3 Source cves: CVE-2026-55603 Source advisory: SNYK:JS-HTTPPROXYMIDDLEWARE-17375007...

@adyen/adyen-salesforce-pwa (>=2.0.0, <=3.0.4), @angular-builders/custom-esbuild (>=18.0.0-beta.3, <=19.1.0) +136 more potentially affected by CVE-2026-55603 via http-proxy-middleware (>=3.0.5, <=3.0.6)

http-proxy-middleware NPM version =3.0.5, =2.0.0, =18.0.0-beta.3, =18.0.0-beta.3, =18.2.6-RC-1, =18.0.0, =18.2.19, =1.0.2, =0.9.1-next.19, =0.9.1-next.19, =0.9.1-next.19, =0.0.4, =3.0.0-alpha-1, =21.2.2-depup.0, =24.3.0-depup.0, =24.11.1-depup.1 and more Source cves: CVE-2026-55603 Source advisor...

@adyen/adyen-salesforce-pwa (>=2.0.0, <=3.0.4), @angular-builders/custom-esbuild (>=18.0.0-beta.3, <=19.1.0) +136 more potentially affected by CVE-2026-55603 via http-proxy-middleware (>=3.0.5, <=3.0.6)

http-proxy-middleware NPM version =3.0.5, =2.0.0, =18.0.0-beta.3, =18.0.0-beta.3, =18.2.6-RC-1, =18.0.0, =18.2.19, =1.0.2, =0.9.1-next.19, =0.9.1-next.19, =0.9.1-next.19, =0.0.4, =3.0.0-alpha-1, =21.2.2-depup.0, =24.3.0-depup.0, =24.11.1-depup.1 and more Source cves: CVE-2026-55603 Source advisor...

@angular-devkit/build-angular (22.1.0-next.0), @oslokommune/auth-bff (>=2.0.1, <=2.2.1) +1 more potentially affected by CVE-2026-55603 via http-proxy-middleware (>=4.0.0, <=4.1.0)

http-proxy-middleware NPM version =4.0.0, =2.0.1, =8.6.0, =8.8.3 Source cves: CVE-2026-55603 Source advisory: OSV:GHSA-GCQ2-9PQ2-CXQM...

CRLF Injection

Overview Affected versions of this package are vulnerable to CRLF Injection via the fixRequestBody function. An attacker can inject or override multipart form fields, potentially bypassing gateway-side validation or access controls, by supplying crafted input containing carriage return and line...

NPM: http-proxy-middleware: multipart/form-data field injection via unescaped CRLF in `fixRequestBody`

NPM: http-proxy-middleware: multipart/form-data field injection via unescaped CRLF in fixRequestBody vulnerability discovered by ? in WordPress Npm http-proxy-middleware versions = 3.0.4, 3.0.7...

GHSA-64MM-VXMG-Q3VJ http-proxy-middleware `router` host+path substring matching allows Host-header-driven backend routing bypass

Summary 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 configur...

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

Summary 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 configur...

Partial String Comparison

Overview Affected versions of this package are vulnerable to Partial String Comparison via the router component. An attacker can route requests to unintended backend servers by sending crafted HTTP requests with manipulated Host headers. Remediation Upgrade http-proxy-middleware to version 2.0.10...

@adyen/adyen-salesforce-pwa (>=2.0.0, <=3.0.4), @amazeelabs/publisher (>=2.4.28, <=3.2.6) +208 more potentially affected by CVE-2026-55602 via http-proxy-middleware (>=3.0.0, <=3.0.5)

http-proxy-middleware NPM version =3.0.0, =2.0.0, =2.4.28, =18.0.0-beta.3, =18.0.0-beta.3, =18.2.6-RC-1, =18.0.0, =18.0.0-next.3, =1.0.0, =0.9.1-next.19, =0.9.1-next.19, =0.9.1-next.19, =0.0.4, =3.0.0-alpha-1, =21.2.2-depup.0, =21.2.7-depup.0 and more Source cves: CVE-2026-55602 Source advisory:...

@angular-devkit/build-angular (22.1.0-next.0), @oslokommune/auth-bff (>=2.0.1, <=2.2.1) +1 more potentially affected by CVE-2026-55602 via http-proxy-middleware (4.0.0)

http-proxy-middleware NPM version 4.0.0 is affected by a known vulnerability. The following packages have a transitive dependency on http-proxy-middleware and may be impacted: - @angular-devkit/build-angular 22.1.0-next.0 - @oslokommune/auth-bff =2.0.1, =8.6.0, =8.7.1 Source cves: CVE-2026-55602...

@angular-devkit/build-angular (22.1.0-next.0), @oslokommune/auth-bff (>=2.0.1, <=2.2.1) +1 more potentially affected by CVE-2026-55602 via http-proxy-middleware (4.0.0)

http-proxy-middleware NPM version 4.0.0 is affected by a known vulnerability. The following packages have a transitive dependency on http-proxy-middleware and may be impacted: - @angular-devkit/build-angular 22.1.0-next.0 - @oslokommune/auth-bff =2.0.1, =8.6.0, =8.7.1 Source cves: CVE-2026-55602...