CVE-2026-91997: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-755x-c9g7-3hr7
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CVSS 5.3
CWE-697
Published
Advisory Summary

CVE-2026-91997 is a MODERATE (CVSS 5.3) security vulnerability vulnerability (CWE-697: Incorrect Comparison) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product compares two entities in a security-relevant context, but the comparison is incorrect.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-91997 at a Glance

CVE Identifier CVE-2026-91997
GHSA Identifier GHSA-755x-c9g7-3hr7
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-697: Incorrect Comparison
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-91997

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-91997, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-697: Incorrect Comparison, where the product compares two entities in a security-relevant context, but the comparison is incorrect. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

evolution-api through 2.3.7 contains an incorrect array comparison in the metricsIPWhitelist middleware that always evaluates to false, allowing unauthenticated access to the /metrics endpoint. Attackers can bypass IP whitelist restrictions to access sensitive metrics disclosing server version, database client name, configured server URL, and WhatsApp instance details.

References

NVD — CVE-2026-91997 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-91997
Software Source Repository REPOSITORY
https://github.com/evolution-foundation/evolution-api
Software Source Repository REPOSITORY
https://github.com/evolution-foundation/evolution-api/blob/2.3.7/src/api/routes/index.router.ts#L49-L65
Software Source Repository REPOSITORY
https://github.com/geo-chen/oss/blob/main/evolution-api.md
www.vulncheck.com/advisories/evolutio... WEB
https://www.vulncheck.com/advisories/evolution-api-through-2.3.7-prometheus-metrics-ip-allowlist-bypass

Frequently Asked Questions

What is CVE-2026-91997?
CVE-2026-91997 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-697: Incorrect Comparison.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-91997?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-91997?
CVE-2026-91997 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-91997?
CVE-2026-91997 is classified under CWE-697: Incorrect Comparison (The product compares two entities in a security-relevant context, but the comparison is incorrect.).
How can I check Maven dependencies for CVE-2026-91997?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-755x-c9g7-3hr7",
  "modified" : "2026-09-15T12:31:47Z",
  "published" : "2026-09-15T12:31:47Z",
  "aliases" : [ "CVE-2026-91997" ],
  "details" : "evolution-api through 2.3.7 contains an incorrect array comparison in the metricsIPWhitelist middleware that always evaluates to false, allowing unauthenticated access to the /metrics endpoint. Attackers can bypass IP whitelist restrictions to access sensitive metrics disclosing server version, database client name, configured server URL, and WhatsApp instance details.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-91997"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/evolution-foundation/evolution-api"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/evolution-foundation/evolution-api/blob/2.3.7/src/api/routes/index.router.ts#L49-L65"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/geo-chen/oss/blob/main/evolution-api.md"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/evolution-api-through-2.3.7-prometheus-metrics-ip-allowlist-bypass"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-697" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-15T12:17:55Z"
  }
}