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...

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...

@adyen/adyen-salesforce-pwa (>=2.0.0, <=3.0.4), @angular-builders/custom-esbuild (>=18.0.0-beta.3, <=19.1.0) +132 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, =24.3.0-depup.0, =2.4.3-nextjs-16.27-07-26-15-19, =2.6.2-govgr-5180.14-10-26-16-05 and more Source cve...

@adyen/adyen-salesforce-pwa (>=2.0.0, <=3.0.4), @angular-builders/custom-esbuild (>=18.0.0-beta.3, <=19.1.0) +132 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, =24.3.0-depup.0, =2.4.3-nextjs-16.27-07-26-15-19, =2.6.2-govgr-5180.14-10-26-16-05 and more Source cve...

@adyen/adyen-salesforce-pwa (>=2.0.0, <=3.0.4), @angular-builders/custom-esbuild (>=18.0.0-beta.3, <=19.1.0) +132 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, =24.3.0-depup.0, =2.4.3-nextjs-16.27-07-26-15-19, =2.6.2-govgr-5180.14-10-26-16-05 and more Source cve...

@oslokommune/auth-bff (>=2.0.1, <=2.2.1), @sap/vite-plugin-leanix-custom-report (>=8.6.0, <=8.8.3) +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, =0.4.5, =0.5.0 Source cves: CVE-2026-55603 Source advisory: SNYK:JS-HTTPPROXYMIDDLEWARE-17375007...

@oslokommune/auth-bff (>=2.0.1, <=2.2.1), @sap/vite-plugin-leanix-custom-report (>=8.6.0, <=8.8.3) +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, =0.4.5, =0.5.0 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...

@oslokommune/auth-bff (>=2.0.1, <=2.2.1), @sap/vite-plugin-leanix-custom-report (>=8.6.0, <=8.8.3) +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, =0.4.5, =0.5.0 Source cves: CVE-2026-55603 Source advisory: GHSA-GCQ2-9PQ2-CXQM...

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...

@adyen/adyen-salesforce-pwa (>=2.0.0, <=3.0.4), @amazeelabs/publisher (>=2.4.28, <=3.2.6) +199 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, =24.3.0-depup.0, =24.11.1-depup.1 and more Source cves: CVE-2026-55602 Source advisory:...

@adyen/adyen-salesforce-pwa (>=2.0.0, <=3.0.4), @amazeelabs/publisher (>=2.4.28, <=3.2.6) +199 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, =24.3.0-depup.0, =24.11.1-depup.1 and more Source cves: CVE-2026-55602 Source advisory:...

@adyen/adyen-salesforce-pwa (>=2.0.0, <=3.0.4), @amazeelabs/publisher (>=2.4.28, <=3.2.6) +199 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, =24.3.0-depup.0, =24.11.1-depup.1 and more Source cves: CVE-2026-55602 Source advisory:...

@oslokommune/auth-bff (>=2.0.1, <=2.2.1), @sap/vite-plugin-leanix-custom-report (>=8.6.0, <=8.7.1) +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: - @oslokommune/auth-bff =2.0.1, =8.6.0, =0.4.5, =0.5.0 Source cves: CVE-2026-55602 Source advisory: OSV:GHSA-64MM-VXMG-Q3...

@oslokommune/auth-bff (>=2.0.1, <=2.2.1), @sap/vite-plugin-leanix-custom-report (>=8.6.0, <=8.7.1) +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: - @oslokommune/auth-bff =2.0.1, =8.6.0, =0.4.5, =0.5.0 Source cves: CVE-2026-55602 Source advisory:...

@oslokommune/auth-bff (>=2.0.1, <=2.2.1), @sap/vite-plugin-leanix-custom-report (>=8.6.0, <=8.7.1) +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: - @oslokommune/auth-bff =2.0.1, =8.6.0, =0.4.5, =0.5.0 Source cves: CVE-2026-55602 Source advisory: GHSA-64MM-VXMG-Q3VJ...

-tompan-reacttemplate (>=1.0.1, <=1.1.0), 0726react (0.1.1) +31042 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 -...

-tompan-reacttemplate (>=1.0.1, <=1.1.0), 0726react (0.1.1) +31042 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 -...

-tompan-reacttemplate (>=1.0.1, <=1.1.0), 0726react (0.1.1) +31042 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 -...