Vulnerabilities in pkg:pypi/emmett

PACKAGE
Advisory Identifier: GHSA-pr46-2v3c-5356
Share
Advisory Summary

CVE-2026-39847 is a HIGH (CVSS 7.5) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Emmett libraries in the PyPI ecosystem. The issue involves emmett has a path traversal in internal assets handler. Remediation is available by upgrading affected packages to version 2.8.1.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:pypi/emmett

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:pypi/emmett. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-pr46-2v3c-5356 CVE-2026-39847 HIGH Emmett has a path traversal in internal assets handler

CVE-2026-39847 at a Glance

CVE Identifier CVE-2026-39847
GHSA Identifier GHSA-pr46-2v3c-5356
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Emmett
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:H/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 High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-39847

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

emmett fixed: 2.8.1 
pip install emmett>=2.8.1
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 emmett

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-39847, inspect your installed packages using pip:

pip show emmett

Analyze the terminal output to locate any version of Emmett in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.8.1), your application is affected.

Note: The pip show emmett command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Emmett, 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

The RSGI static handler for Emmett's internal assets (`/__emmett__` paths) is vulnerable to path traversal attacks. An attacker can use `../` sequences (eg `/__emmett__/../rsgi/handlers.py`) to read arbitrary files outside the assets directory.

CVE-2026-39847 Affected Emmett Versions

1 component(s)
Fixed Versions:
2.8.1
Product / Package Ecosystem Affected Versions Fixed Version
emmett
pypi/emmett
PyPI
≥ 2.5.0
< 2.8.1
2.8.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/emmett-framework/emmett/security/advisories/GHSA-pr46-2v3c-5356
NVD — CVE-2026-39847 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-39847
Emmett Source Repository REPOSITORY
https://github.com/emmett-framework/emmett
Emmett Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/emmett/PYSEC-2026-59.yaml

Frequently Asked Questions

What is CVE-2026-39847?
CVE-2026-39847 is a security vulnerability in Emmett involving Emmett has a path traversal in internal assets handler under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Emmett versions are affected?
Affected versions include releases prior to 2.8.1 across affected packages: emmett.
What version fixes CVE-2026-39847?
Upgrading to 2.8.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is emmett affected?
Yes, emmett is affected in releases prior to 2.8.1. Upgrade your dependency to 2.8.1 or later.
What is the CVSS score of CVE-2026-39847?
CVE-2026-39847 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-39847?
CVE-2026-39847 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check PyPI dependencies for CVE-2026-39847?
Run the dependency tree command: 'pip show emmett'. 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-pr46-2v3c-5356",
  "modified" : "2026-06-06T00:26:38Z",
  "published" : "2026-04-08T00:18:46Z",
  "aliases" : [ "CVE-2026-39847" ],
  "summary" : "Emmett has a path traversal in internal assets handler",
  "details" : "The RSGI static handler for Emmett's internal assets (`/__emmett__` paths) is vulnerable to path traversal attacks.\n\nAn attacker can use `../` sequences (eg `/__emmett__/../rsgi/handlers.py`) to read arbitrary files outside the assets directory.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "emmett"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.5.0"
      }, {
        "fixed" : "2.8.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/emmett-framework/emmett/security/advisories/GHSA-pr46-2v3c-5356"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-39847"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/emmett-framework/emmett"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/emmett/PYSEC-2026-59.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-08T00:18:46Z",
    "nvd_published_at" : "2026-04-07T22:16:23Z"
  }
}