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aiohttp: AIOHTTP: Denial of Service via excessive CPU usage in chunked message handling

cve CVE-2025-69229 2 sources, 2 claims · Watch

Red Hat writes:
aiohttp: AIOHTTP: Denial of Service via excessive CPU usage in chunked message handling the claim

What it is to other things

affectsaiohttp/aiohttp
NVD
made_byaiohttp
NVD

In words only, so not counted until a person confirms one:

affectsaio_libs/aiohttp
NVD says “aio-libs · aiohttp”
made_byaio_libs
NVD says “aio-libs”

What each source says

PropertySourceSaidMeans here
Cvss
cvss
conflict		NVD5.3
receipt
Source
NVD
Its words
5.3
Read by
field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since
2026-10-02 12:00 UTC
Last answered
2026-10-05 12:24 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "aiohttp",
            "vendor": "aio-libs",
            "versions": [
              {
                "status": "affected",
                "version": "< 3.13.3"
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      }
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      }
    ],
    "id": "CVE-2025-69229",
    "lastModified": "2026-09-30T22:10:00.273",
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—
Cvss
cvss
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receipt
Source
Red Hat
Its words
5.8
Read by
field:cvss3_score
Said since
2026-09-29 09:44 UTC
Last answered
2026-10-05 12:24 UTC
Original
open at the source
What the source handed over
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  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2427257",
  "bugzilla_description": "aiohttp: AIOHTTP: Denial of Service via excessive CPU usage in chunked message handling",
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}
—
Cwe
cwe
Red HatCWE-770
receipt
Source
Red Hat
Its words
CWE-770
Read by
field:CWE
Said since
2026-09-29 09:44 UTC
Last answered
2026-10-05 12:24 UTC
Original
open at the source
What the source handed over
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}
—
Product
product
NVDaiohttp
receipt
Source
NVD
Its words
aiohttp
Read by
field:cve.affected[].affectedData[].product
Said since
2026-10-02 12:00 UTC
Last answered
2026-10-05 12:24 UTC
Original
open at the source
What the source handed over
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      {
        "affectedData": [
          {
            "product": "aiohttp",
            "vendor": "aio-libs",
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—
Severity
severity
Red Hatmoderate
A flaw that is harder to exploit, or whose impact is limited.
receipt
Source
Red Hat
Its words
moderate
Read by
field:severity
Said since
2026-09-29 09:44 UTC
Last answered
2026-10-05 12:24 UTC
Original
open at the source
What the source handed over
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medium
Status
status
NVDAnalyzed
receipt
Source
NVD
Its words
Analyzed
Read by
field:cve.vulnStatus
Said since
2026-10-02 12:00 UTC
Last answered
2026-10-05 12:24 UTC
Original
open at the source
What the source handed over
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                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-01-06T14:24:45.403446Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-01-06T00:15:48.347",
    "references": [
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/aio-libs/aiohttp/commit/4ed97a4e46eaf61bd0f05063245f613469700229"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/aio-libs/aiohttp/commit/dc3170b56904bdf814228fae70a5501a42a6c712"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g84x-mcqj-x9qq"
      }
    ],
    "sourceIdentifier": "security-advisories@github.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-770"
          }
        ],
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  }
}
—
Vendor
vendor
NVDaio-libs
receipt
Source
NVD
Its words
aio-libs
Read by
field:cve.affected[].affectedData[].vendor
Said since
2026-10-02 12:00 UTC
Last answered
2026-10-05 12:24 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "aiohttp",
            "vendor": "aio-libs",
            "versions": [
              {
                "status": "affected",
                "version": "< 3.13.3"
              }
            ]
          }
        ],
        "source": "security-advisories@github.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "715B630E-B141-4247-A920-3FFBD8045A05",
                "versionEndExcluding": "3.13.3",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. In versions 3.13.2 and below, handling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks. If an application makes use of the request.read() method in an endpoint, it may be possible for an attacker to cause the server to spend a moderate amount of blocking CPU time (e.g. 1 second) while processing the request. This could potentially lead to DoS as the server would be unable to handle other requests during that time. This issue is fixed in version 3.13.3."
      },
      {
        "lang": "es",
        "value": "AIOHTTP es un framework HTTP cliente/servidor asíncrono para asyncio y Python. En las versiones 3.13.2 e inferiores, el manejo de mensajes fragmentados puede resultar en un uso excesivo de CPU de bloqueo al recibir un gran número de fragmentos. Si una aplicación utiliza el método request.read() en un punto final, un atacante podría hacer que el servidor dedique una cantidad moderada de tiempo de CPU de bloqueo (por ejemplo, 1 segundo) mientras procesa la solicitud. Esto podría conducir potencialmente a DoS ya que el servidor no podría manejar otras solicitudes durante ese tiempo. Este problema está solucionado en la versión 3.13.3."
      }
    ],
    "id": "CVE-2025-69229",
    "lastModified": "2026-09-30T22:10:00.273",
    "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": "nvd@nist.gov",
          "type": "Primary"
        }
      ],
      "cvssMetricV40": [
        {
          "cvssData": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
            "baseScore": 6.6,
            "baseSeverity": "MEDIUM",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "UNREPORTED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "source": "security-advisories@github.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2025-69229",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-01-06T14:24:45.403446Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-01-06T00:15:48.347",
    "references": [
      {
        "source": "security-advisories@github.com",
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      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/aio-libs/aiohttp/commit/dc3170b56904bdf814228fae70a5501a42a6c712"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g84x-mcqj-x9qq"
      }
    ],
    "sourceIdentifier": "security-advisories@github.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-770"
          }
        ],
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  }
}
—

vulnerability

aiohttp: AIOHTTP: Denial of Service via excessive CPU usage in chunked message handling
zetlyn/cve-redhat · 2026-01-05
cvss 5.8 cwe CWE-770 severity moderate source
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. In versions 3.13.2 and below, handling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks. If an application makes use of the request.read() method in an endpoint, it may be possible for an attacker to cause the server to spend a moderate amount of blocking CPU time (e.g. 1 second) while processing the request. This could potentially lead to DoS as the server would be unable to handle other requests during that time. This issue is fixed in version 3.13.3.
zetlyn/cve-nvd · 2026-01-06
cvss 5.3 product aiohttp status Analyzed vendor aio-libs source