CVE-2026-55602 Vulnerability Analysis & Exploit Details

CVE-2026-55602
Vulnerability Scoring

8.6
/10
Severe Risk

Cybersecurity professionals consider CVE-2026-55602 an immediate threat requiring urgent mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Changed
    Successful exploitation can impact components beyond the vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-55602 Details

Status: Analyzed

Last updated: 🕗 26 Jun 2026, 20:06 UTC
Originally published on: 🕕 22 Jun 2026, 18:16 UTC

Time between publication and last update: 4 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

CVE-2026-55602 Vulnerability Summary

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 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.

Assessing the Risk of CVE-2026-55602

Access Complexity Graph

The exploitability of CVE-2026-55602 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-55602

With low attack complexity and no required privileges, CVE-2026-55602 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-55602, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-55602, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2026-55602 has no significant impact on data confidentiality.
  • Integrity: High
    CVE-2026-55602 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: None
    CVE-2026-55602 does not impact system availability.

CVE-2026-55602 References

External References

CWE Common Weakness Enumeration

CWE-187

Vulnerable Configurations

  • cpe:2.3:a:chimurai:http-proxy-middleware:0.16.0:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.16.0:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:0.17.0:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.17.0:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:0.17.1:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.17.1:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:0.17.2:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.17.2:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:0.17.3:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.17.3:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:0.17.4:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.17.4:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:0.18.0:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.18.0:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:0.19.0:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.19.0:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:0.19.1:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.19.1:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:0.19.2:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.19.2:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:0.20.0:-:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.20.0:-:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:0.20.0:beta0:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.20.0:beta0:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:0.21.0:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:0.21.0:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.0.4:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.0.4:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.0.5:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.0.5:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.0.6:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.0.6:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.1.2:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.1.2:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:1.3.1:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:1.3.1:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:2.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:2.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:2.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:2.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:2.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:2.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:2.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:2.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:2.0.4:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:2.0.4:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:2.0.5:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:2.0.5:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:2.0.6:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:2.0.6:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:2.0.7:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:2.0.7:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:2.0.7:beta0:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:2.0.7:beta0:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:2.0.7:beta1:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:2.0.7:beta1:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:2.0.8:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:2.0.8:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:2.0.9:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:2.0.9:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:3.0.0:-:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:3.0.0:-:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:3.0.0:beta0:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:3.0.0:beta0:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:3.0.0:beta1:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:3.0.0:beta1:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:3.0.1:-:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:3.0.1:-:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:3.0.1:beta0:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:3.0.1:beta0:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:3.0.1:beta1:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:3.0.1:beta1:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:3.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:3.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:3.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:3.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:3.0.4:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:3.0.4:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:3.0.5:*:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:3.0.5:*:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:-:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:-:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta0:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta0:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta1:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta1:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta2:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta2:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta3:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta3:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta4:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta4:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta5:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta5:*:*:*:*:*:*
  • cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta6:*:*:*:*:*:*
    cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0:beta6:*:*:*:*:*:*

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