FKIE_CVE-2023-37276

Vulnerability from fkie_nvd - Published: 2023-07-19 20:15 - Updated: 2026-06-17 06:07
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. aiohttp v3.8.4 and earlier are bundled with llhttp v6.0.6. Vulnerable code is used by aiohttp for its HTTP request parser when available which is the default case when installing from a wheel. This vulnerability only affects users of aiohttp as an HTTP server (ie `aiohttp.Application`), you are not affected by this vulnerability if you are using aiohttp as an HTTP client library (ie `aiohttp.ClientSession`). Sending a crafted HTTP request will cause the server to misinterpret one of the HTTP header values leading to HTTP request smuggling. This issue has been addressed in version 3.8.5. Users are advised to upgrade. Users unable to upgrade can reinstall aiohttp using `AIOHTTP_NO_EXTENSIONS=1` as an environment variable to disable the llhttp HTTP request parser implementation. The pure Python implementation isn't vulnerable.
References
security-advisories@github.comhttps://github.com/aio-libs/aiohttp/blob/v3.8.4/.gitmodulesProduct
security-advisories@github.comhttps://github.com/aio-libs/aiohttp/commit/9337fb3f2ab2b5f38d7e98a194bde6f7e3d16c40Patch
security-advisories@github.comhttps://github.com/aio-libs/aiohttp/security/advisories/GHSA-45c4-8wx5-qw6wExploit, Mitigation, Vendor Advisory
security-advisories@github.comhttps://hackerone.com/reports/2001873Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/aio-libs/aiohttp/blob/v3.8.4/.gitmodulesProduct
af854a3a-2127-422b-91ae-364da2661108https://github.com/aio-libs/aiohttp/commit/9337fb3f2ab2b5f38d7e98a194bde6f7e3d16c40Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/aio-libs/aiohttp/security/advisories/GHSA-45c4-8wx5-qw6wExploit, Mitigation, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://hackerone.com/reports/2001873Exploit, Third Party Advisory
Impacted products
Vendor Product Version
aiohttp aiohttp *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "aiohttp",
          "vendor": "aio-libs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.8.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:aio-libs_project:aiohttp:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unknown",
          "product": "aiohttp",
          "vendor": "aio-libs_project",
          "versions": [
            {
              "lessThan": "3.8.5",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2108175E-0BE7-48A0-B191-AFA35C485AF3",
              "versionEndIncluding": "3.8.4",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. aiohttp v3.8.4 and earlier are bundled with llhttp v6.0.6. Vulnerable code is used by aiohttp for its HTTP request parser when available which is the default case when installing from a wheel. This vulnerability only affects users of aiohttp as an HTTP server (ie `aiohttp.Application`), you are not affected by this vulnerability if you are using aiohttp as an HTTP client library (ie `aiohttp.ClientSession`). Sending a crafted HTTP request will cause the server to misinterpret one of the HTTP header values leading to HTTP request smuggling. This issue has been addressed in version 3.8.5. Users are advised to upgrade. Users unable to upgrade can reinstall aiohttp using `AIOHTTP_NO_EXTENSIONS=1` as an environment variable to disable the llhttp HTTP request parser implementation. The pure Python implementation isn\u0027t vulnerable."
    }
  ],
  "id": "CVE-2023-37276",
  "lastModified": "2026-06-17T06:07:52.237",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
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        "impactScore": 1.4,
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        "type": "Secondary"
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          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
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          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-10-18T16:05:51.434153Z",
          "version": "2.0.3"
        }
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  },
  "published": "2023-07-19T20:15:10.603",
  "references": [
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      "tags": [
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    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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    },
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    },
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
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          "value": "CWE-444"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
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    {
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          "value": "CWE-444"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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