CVE-2023-26364: @adobe/css tools Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-hpx4-r86g-5jrg
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CVSS 5.0
CWE-1333 CWE-20
Published
Advisory Summary

CVE-2023-26364 is a MODERATE (CVSS 5.0) denial of service vulnerability (CWE-1333: Inefficient Regular Expression Complexity) affecting @adobe/css tools libraries in the npm ecosystem. The issue involves @adobe/css-tools regular expression denial of service (redos) while parsing css. Remediation is available by upgrading affected packages to version 4.3.1.

CVE-2023-26364 at a Glance

CVE Identifier CVE-2023-26364
GHSA Identifier GHSA-hpx4-r86g-5jrg
Severity MODERATE
CVSS v3.1 Base Score 5.0
CWE Classification CWE-1333: Inefficient Regular Expression Complexity
Affected Product @adobe/css tools
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.0

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

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

How to Fix CVE-2023-26364

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

@adobe/css-tools fixed: 4.3.1 
npm install @adobe/css-tools@4.3.1
Verify Direct and Transitive Dependencies

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

npm ls @adobe/css-tools

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2023-26364, inspect your project dependencies using npm:

npm ls @adobe/css-tools

Analyze the terminal output to locate any version of @adobe/css tools in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.3.1), your application is affected.

Note: The npm ls @adobe/css-tools command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1333: Inefficient Regular Expression Complexity, where the product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential. In @adobe/css tools, 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

### Impact @adobe/css-tools version 4.3.0 and earlier are affected by an Improper Input Validation vulnerability that could result in a denial of service while attempting to parse CSS. ### Patches The issue has been resolved in 4.3.1. ### Workarounds None ### References N/A

CVE-2023-26364 Affected @adobe/css tools Versions

1 component(s)
Fixed Versions:
4.3.1
Product / Package Ecosystem Affected Versions Fixed Version
@adobe/css-tools
npm/@adobe/css-tools
npm
< 4.3.1
4.3.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/adobe/css-tools/security/advisories/GHSA-hpx4-r86g-5jrg
NVD — CVE-2023-26364 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-26364
Security Fix Commit FIX COMMIT
https://github.com/adobe/css-tools/commit/2b09a25d1dbdbb16fe80065e4c9beb5623ee5793
@adobe/css tools Source Repository REPOSITORY
https://github.com/adobe/css-tools

Frequently Asked Questions

What is CVE-2023-26364?
CVE-2023-26364 is a security vulnerability in @adobe/css tools involving @adobe/css-tools Regular Expression Denial of Service (ReDOS) while Parsing CSS under CWE-1333: Inefficient Regular Expression Complexity.
Which @adobe/css tools versions are affected?
Affected versions include releases prior to 4.3.1 across affected packages: @adobe/css-tools.
What version fixes CVE-2023-26364?
Upgrading to 4.3.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @adobe/css-tools affected?
Yes, @adobe/css-tools is affected in releases prior to 4.3.1. Upgrade your dependency to 4.3.1 or later.
What is the CVSS score of CVE-2023-26364?
CVE-2023-26364 has a CVSS v3.1 base score of 5.0 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L.
What CWE is associated with CVE-2023-26364?
CVE-2023-26364 is classified under CWE-1333: Inefficient Regular Expression Complexity (The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.).
How can I check npm dependencies for CVE-2023-26364?
Run the dependency tree command: 'npm ls @adobe/css-tools'. 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-hpx4-r86g-5jrg",
  "modified" : "2023-11-17T22:06:29Z",
  "published" : "2023-08-29T23:33:26Z",
  "aliases" : [ "CVE-2023-26364" ],
  "summary" : "@adobe/css-tools Regular Expression Denial of Service (ReDOS) while Parsing CSS",
  "details" : "### Impact\n@adobe/css-tools version 4.3.0 and earlier are affected by an Improper Input Validation vulnerability that could result in a denial of service while attempting to parse CSS.\n\n### Patches\nThe issue has been resolved in 4.3.1.\n\n### Workarounds\nNone\n\n### References\nN/A\n\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@adobe/css-tools"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.3.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/adobe/css-tools/security/advisories/GHSA-hpx4-r86g-5jrg"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-26364"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/adobe/css-tools/commit/2b09a25d1dbdbb16fe80065e4c9beb5623ee5793"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/adobe/css-tools"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333", "CWE-20" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-08-29T23:33:26Z",
    "nvd_published_at" : "2023-11-17T14:15:21Z"
  }
}