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: Improper Input Validation

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-2026-55603: Improper Neutralization of CRLF Sequences

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...

@angular-devkit/build-angular (22.1.0-next.0), @oslokommune/auth-bff (>=2.0.1, <=2.2.1) +2 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, =0.4.5, =0.5.0 Source cves: CVE-2026-55603 Source advisory: OSV:GHSA-GCQ2-9PQ2-CXQM...

@angular-devkit/build-angular (22.1.0-next.0), @oslokommune/auth-bff (>=2.0.1, <=2.2.1) +2 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, =0.4.5, =0.5.0 Source cves: CVE-2026-55603 Source advisory: SNYK:JS-HTTPPROXYMIDDLEWARE-17375007...

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...

@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...

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...

@angular-devkit/build-angular (22.1.0-next.0), @oslokommune/auth-bff (>=2.0.1, <=2.2.1) +2 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, =0.4.5, =0.5.0 Source cves:...

@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:...

-tompan-reacttemplate (>=1.0.1, <=1.1.0), 0726react (0.1.1) +31055 more potentially affected by CVE-2026-55602 via http-proxy-middleware (>=0.16.0, <=2.0.9)

http-proxy-middleware NPM version =0.16.0, =1.0.1, =1.1.0 - 0726react 0.1.1 - 0x0.icu.anima 0.1.0 - 0xgank-tea-advice-pull 1.0.0 - 0xgank-tea-balance-pencil 1.0.0 - 0xgank-tea-brick-bell 1.0.0 - 0xgank-tea-cake-victory 1.0.0 - 0xgank-tea-central-compound 1.0.0 - 0xgank-tea-characteristic 1.0.0 -...

@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) +2 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, =0.4.5, =0.5.0 Source cves:...

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

NPM: http-proxy-middleware router host+path substring matching allows Host-header-driven backend routing bypass vulnerability discovered by ? in WordPress Npm http-proxy-middleware versions = 0.16.0, 2.0.10...

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...

-tompan-reacttemplate (>=1.0.1, <=1.1.0), 0726react (0.1.1) +31055 more potentially affected by CVE-2026-55602 via http-proxy-middleware (>=0.16.0, <=2.0.9)

http-proxy-middleware NPM version =0.16.0, =1.0.1, =1.1.0 - 0726react 0.1.1 - 0x0.icu.anima 0.1.0 - 0xgank-tea-advice-pull 1.0.0 - 0xgank-tea-balance-pencil 1.0.0 - 0xgank-tea-brick-bell 1.0.0 - 0xgank-tea-cake-victory 1.0.0 - 0xgank-tea-central-compound 1.0.0 - 0xgank-tea-characteristic 1.0.0 -...

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...

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...

CVE-2026-55603

creationtimestamp| type| source ---|---|--- 2026-06-17 17:17:39+00:00| published-proof-of-concept| https://github.com/chimurai/http-proxy-middleware/security/advisories/GHSA-gcq2-9pq2-cxqm 2026-06-23 09:03:07+00:00| seen| https://bsky.app/profile/hugovalters.bsky.social/post/3mox25jonrk2t...