CVE-2023-26103: Deno Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-jc97-h3h9-7xh6
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CVSS 5.3
CWE-1333
Published
Advisory Summary

CVE-2023-26103 is a MODERATE (CVSS 5.3) denial of service vulnerability (CWE-1333: Inefficient Regular Expression Complexity) affecting Deno libraries in the crates.io ecosystem. The issue involves regular expression denial of service in deno.upgradewebsocket api. Remediation is available by upgrading affected packages to version 1.31.0.

CVE-2023-26103 at a Glance

CVE Identifier CVE-2023-26103
GHSA Identifier GHSA-jc97-h3h9-7xh6
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-1333: Inefficient Regular Expression Complexity
Affected Product Deno
Package Ecosystem crates.io
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:N/I:N/A:L).

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 None (C:N)
Integrity None (I:N)
Availability Low (A:L)

How to Fix CVE-2023-26103

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

deno fixed: 1.31.0 
Upgrade deno to 1.31.0
Verify Direct and Transitive Dependencies

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

inspect dependencies for deno

How to Check if You Are Affected

To determine whether your application is affected by CVE-2023-26103, inspect your project dependencies for Deno:

inspect dependencies for deno

Analyze the terminal output to locate any version of Deno in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.31.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

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 Deno, 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 Versions of the package deno before 1.31.0 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the upgradeWebSocket function, which contains regexes in the form of /s*,s*/, used for splitting the Connection/Upgrade header. A specially crafted Connection/Upgrade header can be used to significantly slow down a web socket server. ### Patches It is recommended that users upgrade to Deno 1.31.0.

CVE-2023-26103 Affected Deno Versions

1 component(s)
Fixed Versions:
1.31.0
Product / Package Ecosystem Affected Versions Fixed Version
deno
 crates.io
≥ 1.12.0
< 1.31.0
1.31.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/denoland/deno/security/advisories/GHSA-jc97-h3h9-7xh6
NVD — CVE-2023-26103 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-26103
Deno Source Repository REPOSITORY
https://github.com/denoland/deno/pull/17722
Security Fix Commit FIX COMMIT
https://github.com/denoland/deno/commit/cf06a7c7e672880e1b38598fe445e2c50b4a9d06
Deno Source Repository REPOSITORY
https://github.com/denoland/deno
Deno Source Repository REPOSITORY
https://github.com/denoland/deno/blob/2b247be517d789a37e532849e2e40b724af0918f/ext/http/01_http.js#L395-L409
Deno Release RELEASE
https://github.com/denoland/deno/releases/tag/v1.31.0
Deno Security Information SECURITY
https://security.snyk.io/vuln/SNYK-RUST-DENO-3315970

Frequently Asked Questions

What is CVE-2023-26103?
CVE-2023-26103 is a security vulnerability in Deno involving Regular Expression Denial of Service in Deno.upgradeWebSocket API under CWE-1333: Inefficient Regular Expression Complexity.
Which Deno versions are affected?
Affected versions include releases prior to 1.31.0 across affected packages: deno.
What version fixes CVE-2023-26103?
Upgrading to 1.31.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is deno affected?
Yes, deno is affected in releases prior to 1.31.0. Upgrade your dependency to 1.31.0 or later.
What is the CVSS score of CVE-2023-26103?
CVE-2023-26103 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:N/I:N/A:L.
What CWE is associated with CVE-2023-26103?
CVE-2023-26103 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 crates.io dependencies for CVE-2023-26103?
Run the dependency tree command: 'inspect dependencies for deno'. 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-jc97-h3h9-7xh6",
  "modified" : "2023-04-03T17:18:51Z",
  "published" : "2023-04-03T17:18:51Z",
  "aliases" : [ "CVE-2023-26103" ],
  "summary" : "Regular Expression Denial of Service in Deno.upgradeWebSocket API",
  "details" : "### Impact\nVersions of the package deno before 1.31.0 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the upgradeWebSocket function, which contains regexes in the form of /s*,s*/, used for splitting the Connection/Upgrade header. A specially crafted Connection/Upgrade header can be used to significantly slow down a web socket server. \n\n### Patches\nIt is recommended that users upgrade to Deno 1.31.0.\n\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "deno"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.12.0"
      }, {
        "fixed" : "1.31.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/denoland/deno/security/advisories/GHSA-jc97-h3h9-7xh6"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-26103"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/denoland/deno/pull/17722"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/denoland/deno/commit/cf06a7c7e672880e1b38598fe445e2c50b4a9d06"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/denoland/deno"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/denoland/deno/blob/2b247be517d789a37e532849e2e40b724af0918f/ext/http/01_http.js#L395-L409"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/denoland/deno/releases/tag/v1.31.0"
  }, {
    "type" : "WEB",
    "url" : "https://security.snyk.io/vuln/SNYK-RUST-DENO-3315970"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-04-03T17:18:51Z",
    "nvd_published_at" : null
  }
}