CVE-2026-44363: Misp modules Remote Code Execution Vulnerability

MODERATE
Advisory Identifier: GHSA-fhq3-2gf3-8f3j
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CWE-295 CWE-918
Published
Advisory Summary

CVE-2026-44363 is a MODERATE remote code execution vulnerability (CWE-295: Improper Certificate Validation) affecting Misp modules libraries in the PyPI ecosystem. The issue involves misp-modules has nsafe remote resource fetching in expansion. Remediation is available in the latest vendor maintenance releases.

CVE-2026-44363 at a Glance

CVE Identifier CVE-2026-44363
GHSA Identifier GHSA-fhq3-2gf3-8f3j
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-295: Improper Certificate Validation
Affected Product Misp modules
Package Ecosystem PyPI
Published Date
Last Updated

How to Fix CVE-2026-44363

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

misp-modules fixed: Latest secure release 
pip install misp-modules>=Latest secure release
Verify Direct and Transitive Dependencies

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

pip show misp-modules

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-44363, inspect your installed packages using pip:

pip show misp-modules

Analyze the terminal output to locate any version of Misp modules 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 pip show misp-modules command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In Misp modules, 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

An unsafe remote resource fetching vulnerability existed in MISP Modules expansion modules. The html_to_markdown module accepted arbitrary HTTP(S) URLs without sufficient validation, which could allow Server-Side Request Forgery against loopback, private, or link-local network resources. Additionally, the qrcode module disabled TLS certificate verification when retrieving remote images, exposing requests to potential man-in-the-middle interception or response tampering. The issue was fixed by validating URL schemes, blocking local and private address ranges, resolving hostnames before fetching, enforcing request timeouts, and re-enabling TLS certificate verification. As reported by Bilal Teke.

CVE-2026-44363 Affected Misp modules Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
misp-modules
pypi/misp-modules
PyPI
≤ 3.0.7

References

GitHub Advisory / Wiki ADVISORY
https://github.com/MISP/misp-modules/security/advisories/GHSA-fhq3-2gf3-8f3j
NVD — CVE-2026-44363 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44363
Security Fix Commit FIX COMMIT
https://github.com/MISP/misp-modules/commit/01a522f2772fc31eeed379ccf23750c8a3d401db
Misp modules Source Repository REPOSITORY
https://github.com/MISP/misp-modules

Frequently Asked Questions

What is CVE-2026-44363?
CVE-2026-44363 is a security vulnerability in Misp modules involving misp-modules has nsafe remote resource fetching in expansion under CWE-295: Improper Certificate Validation.
Which Misp modules versions are affected?
Affected versions include releases prior to current release patches across affected packages: misp-modules.
What version fixes CVE-2026-44363?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is misp-modules affected?
Yes, misp-modules is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with CVE-2026-44363?
CVE-2026-44363 is classified under CWE-295: Improper Certificate Validation (The product does not validate, or incorrectly validates, a certificate.).
How can I check PyPI dependencies for CVE-2026-44363?
Run the dependency tree command: 'pip show misp-modules'. 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-fhq3-2gf3-8f3j",
  "modified" : "2026-05-14T20:42:26Z",
  "published" : "2026-05-06T22:31:03Z",
  "aliases" : [ "CVE-2026-44363" ],
  "summary" : "misp-modules has nsafe remote resource fetching in expansion",
  "details" : "An unsafe remote resource fetching vulnerability existed in MISP Modules expansion modules. The html_to_markdown module accepted arbitrary HTTP(S) URLs without sufficient validation, which could allow Server-Side Request Forgery against loopback, private, or link-local network resources. Additionally, the qrcode module disabled TLS certificate verification when retrieving remote images, exposing requests to potential man-in-the-middle interception or response tampering. The issue was fixed by validating URL schemes, blocking local and private address ranges, resolving hostnames before fetching, enforcing request timeouts, and re-enabling TLS certificate verification. As reported by Bilal Teke.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "misp-modules"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "3.0.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/MISP/misp-modules/security/advisories/GHSA-fhq3-2gf3-8f3j"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-44363"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/MISP/misp-modules/commit/01a522f2772fc31eeed379ccf23750c8a3d401db"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/MISP/misp-modules"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295", "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-06T22:31:03Z",
    "nvd_published_at" : "2026-05-13T20:16:23Z"
  }
}