FKIE_CVE-2026-107287

Vulnerability from fkie_nvd - Published: 2026-10-08 16:17 - Updated: 2026-10-14 01:17
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Summary
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.7 and 2.52.0, the local web_fetch_tool and the WebFetch local fallback can consume excessive CPU and memory during HTML-to-Markdown conversion of attacker-controlled HTML containing deeply nested block elements. Conversion repeatedly reprocesses accumulated text and can greatly expand intermediate output before the returned-content limit is applied, allowing a model-directed fetch to delay other work in the process. Provider-native web fetching is not affected. This issue is fixed in versions 1.107.7 and 2.52.0.
References
security-advisories@github.comhttps://github.com/pydantic/pydantic-ai/commit/2b247add4950bef61d352e7ca8aefbd20539180cPatch
security-advisories@github.comhttps://github.com/pydantic/pydantic-ai/commit/2fd38792693da00a3ca5412aeffb436787af3545Patch
security-advisories@github.comhttps://github.com/pydantic/pydantic-ai/pull/8984Patch, Vendor Advisory
security-advisories@github.comhttps://github.com/pydantic/pydantic-ai/pull/8985Patch, Vendor Advisory
security-advisories@github.comhttps://github.com/pydantic/pydantic-ai/releases/tag/v1.107.7Patch, Release Notes, Vendor Advisory
security-advisories@github.comhttps://github.com/pydantic/pydantic-ai/releases/tag/v2.52.0Patch, Release Notes, Vendor Advisory
security-advisories@github.comhttps://github.com/pydantic/pydantic-ai/security/advisories/GHSA-v36g-jcw9-x7cwVendor Advisory
Impacted products
Vendor Product Version
pydantic pydantic_ai *
pydantic pydantic_ai *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "pydantic-ai",
          "vendor": "pydantic",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.77.0, \u003c 1.107.7"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.0.0b1, \u003c 2.52.0"
            }
          ]
        },
        {
          "product": "pydantic-ai-slim",
          "vendor": "pydantic",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.77.0, \u003c 1.107.7"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.0.0b1, \u003c 2.52.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:pydantic:pydantic_ai:*:*:*:*:*:python:*:*",
              "matchCriteriaId": "FF3E6D2A-5751-433C-8415-AE070B5FFF87",
              "versionEndExcluding": "1.107.7",
              "versionStartIncluding": "1.77.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:pydantic:pydantic_ai:*:-:*:*:*:python:*:*",
              "matchCriteriaId": "3385037B-7B85-456F-972A-205F60EB51A2",
              "versionEndExcluding": "2.52.0",
              "versionStartIncluding": "2.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.7 and 2.52.0, the local web_fetch_tool and the WebFetch local fallback can consume excessive CPU and memory during HTML-to-Markdown conversion of attacker-controlled HTML containing deeply nested block elements. Conversion repeatedly reprocesses accumulated text and can greatly expand intermediate output before the returned-content limit is applied, allowing a model-directed fetch to delay other work in the process. Provider-native web fetching is not affected. This issue is fixed in versions 1.107.7 and 2.52.0."
    }
  ],
  "id": "CVE-2026-107287",
  "lastModified": "2026-10-14T01:17:04.887",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-107287",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-14T00:58:47.200664Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-08T16:17:03.973",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/pydantic/pydantic-ai/commit/2b247add4950bef61d352e7ca8aefbd20539180c"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/pydantic/pydantic-ai/commit/2fd38792693da00a3ca5412aeffb436787af3545"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
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        "Vendor Advisory"
      ],
      "url": "https://github.com/pydantic/pydantic-ai/pull/8984"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/pydantic/pydantic-ai/pull/8985"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Release Notes",
        "Vendor Advisory"
      ],
      "url": "https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.7"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Release Notes",
        "Vendor Advisory"
      ],
      "url": "https://github.com/pydantic/pydantic-ai/releases/tag/v2.52.0"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-v36g-jcw9-x7cw"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        },
        {
          "lang": "en",
          "value": "CWE-407"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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