CVE-2026-55602Disclosure(chimurai / http-proxy-middleware)

LOWCVSS 8.6 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch chimurai http-proxy-middleware systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

chimurai CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Exploit / PoC references

Weakness type (CWE)

CWE-20CWE-187

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

http-proxy-middleware

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Affected systems

Vendors

chimurai

Products

http-proxy-middleware

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Full discourse1 post

HeroDevs@herodevs91d
Disclosure
CVE-2026-55602: http-proxy-middleware's router matches the Host header by unanchored substring — a crafted Host ending in a configured key reaches that backend, no auth. Maintained lines are patched; EOL 0.19.x, pinned by old webpack tooling, isn't. #CVE #NodeJS #AppSec https://t.co/xlfiEpJHJ5
Post summary
The post announces CVE‑2026‑55602, noting that http‑proxy‑middleware’s router uses unanchored substring matching of the Host header, allowing a crafted Host to reach backends without authentication. It indicates that patched lines are available, but older releases remain vulnerable.
00000177
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CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	chimurai	http-proxy-middleware	-	-	-

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