FKIE_CVE-2023-26103

Vulnerability from fkie_nvd - Published: 2023-02-25 05:15 - Updated: 2026-06-17 05:42
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
report@snyk.iohttps://github.com/denoland/deno/blob/2b247be517d789a37e532849e2e40b724af0918f/ext/http/01_http.js%23L395-L409Broken Link
report@snyk.iohttps://github.com/denoland/deno/commit/cf06a7c7e672880e1b38598fe445e2c50b4a9d06Patch
report@snyk.iohttps://github.com/denoland/deno/pull/17722Patch
report@snyk.iohttps://github.com/denoland/deno/releases/tag/v1.31.0Release Notes
report@snyk.iohttps://security.snyk.io/vuln/SNYK-RUST-DENO-3315970Exploit, Technical Description, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/denoland/deno/blob/2b247be517d789a37e532849e2e40b724af0918f/ext/http/01_http.js%23L395-L409Broken Link
af854a3a-2127-422b-91ae-364da2661108https://github.com/denoland/deno/commit/cf06a7c7e672880e1b38598fe445e2c50b4a9d06Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/denoland/deno/pull/17722Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/denoland/deno/releases/tag/v1.31.0Release Notes
af854a3a-2127-422b-91ae-364da2661108https://security.snyk.io/vuln/SNYK-RUST-DENO-3315970Exploit, Technical Description, Third Party Advisory
Impacted products
Vendor Product Version
deno deno *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "deno",
          "vendor": "n/a",
          "versions": [
            {
              "lessThan": "1.31.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "report@snyk.io"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "EFFBE1A2-4130-4E48-B807-89F14A2D0CE4",
              "versionEndExcluding": "1.31.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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.\r\r"
    }
  ],
  "id": "CVE-2023-26103",
  "lastModified": "2026-06-17T05:42:41.007",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "report@snyk.io",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2023-26103",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-03-11T15:30:55.306498Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2023-02-25T05:15:12.343",
  "references": [
    {
      "source": "report@snyk.io",
      "tags": [
        "Broken Link"
      ],
      "url": "https://github.com/denoland/deno/blob/2b247be517d789a37e532849e2e40b724af0918f/ext/http/01_http.js%23L395-L409"
    },
    {
      "source": "report@snyk.io",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/denoland/deno/commit/cf06a7c7e672880e1b38598fe445e2c50b4a9d06"
    },
    {
      "source": "report@snyk.io",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/denoland/deno/pull/17722"
    },
    {
      "source": "report@snyk.io",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/denoland/deno/releases/tag/v1.31.0"
    },
    {
      "source": "report@snyk.io",
      "tags": [
        "Exploit",
        "Technical Description",
        "Third Party Advisory"
      ],
      "url": "https://security.snyk.io/vuln/SNYK-RUST-DENO-3315970"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Broken Link"
      ],
      "url": "https://github.com/denoland/deno/blob/2b247be517d789a37e532849e2e40b724af0918f/ext/http/01_http.js%23L395-L409"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/denoland/deno/commit/cf06a7c7e672880e1b38598fe445e2c50b4a9d06"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/denoland/deno/pull/17722"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/denoland/deno/releases/tag/v1.31.0"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Technical Description",
        "Third Party Advisory"
      ],
      "url": "https://security.snyk.io/vuln/SNYK-RUST-DENO-3315970"
    }
  ],
  "sourceIdentifier": "report@snyk.io",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "report@snyk.io",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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