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Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl

Type: advisorySources: OSV

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.2 and 2.24.0, web_fetch_tool, the WebFetch local fallback, and remote FileUrl media downloads buffer the complete HTTP response body before enforcing content-size controls. An attacker-influenced URL can stream an arbitrarily large response that exhausts process memory and crashes the worker; affected media types include ImageUrl, DocumentUrl, VideoUrl, and AudioUrl. SSRF protections remain effective, and the impact is limited to availability. This issue is fixed in versions 1.107.2 and 2.24.0.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-107294
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 15:55 UTC · Revision 1

Source evidence

Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl

core-osv · Original source

Published 8 Oct 2026, 16:59 UTC

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.2 and 2.24.0, web_fetch_tool, the WebFetch local fallback, and remote FileUrl media downloads buffer the complete HTTP response body before enforcing content-size controls. An attacker-influenced URL can stream an arbitrarily large response that exhausts process memory and crashes the worker; affected media types include ImageUrl, DocumentUrl, VideoUrl, and AudioUrl. SSRF protections remain effective, and the impact is limited to availability. This issue is fixed in versions 1.107.2 and 2.24.0.

osv:CVE-2026-107294
Complete source record
{
  "id": "8b20e5c48833aaf2ddb86133d1b4a6f367d9a90fb7e2f2cb057fc2e6f5abfc64",
  "url": "https://osv.dev/vulnerability/CVE-2026-107294",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl",
    "summary": "Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.2 and 2.24.0, web_fetch_tool, the WebFetch local fallback, and remote FileUrl media downloads buffer the complete HTTP response body before enforcing content-size controls. An attacker-influenced URL can stream an arbitrarily large response that exhausts process memory and crashes the worker; affected media types include ImageUrl, DocumentUrl, VideoUrl, and AudioUrl. SSRF protections remain effective, and the impact is limited to availability. This issue is fixed in versions 1.107.2 and 2.24.0.",
    "evidence": "osv:CVE-2026-107294",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-107294",
      "aliases": [
        "CVE-2026-107294",
        "GHSA-v2xh-2vp8-57h8",
        "PYSEC-2026-4280",
        "PYSEC-2026-4289"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/pydantic/pydantic-ai",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a282bcade2c2a75847806bbba9cf511dd0623019"
                },
                {
                  "fixed": "e3824a58c82864ed26afb2887619834a4eb86cc8"
                },
                {
                  "introduced": "e19e18065a13be0490483ad3c5601d232af8185b"
                },
                {
                  "fixed": "7a64d049c3f5271a975cd1d64b2fa876d83ede1d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:pydantic:pydantic_ai:*:*:*:*:*:python:*:*",
                    "range": [
                      {
                        "introduced": "1.77.0"
                      },
                      {
                        "fixed": "1.107.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:pydantic:pydantic_ai:*:-:*:*:*:python:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "fixed": "2.24.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7a64d049c3f5271a975cd1d64b2fa876d83ede1d"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e3824a58c82864ed26afb2887619834a4eb86cc8"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e3824a58c82864ed26afb2887619834a4eb86cc8"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.107.2"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7a64d049c3f5271a975cd1d64b2fa876d83ede1d"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.24.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.107.1",
            "v2.23.0",
            "v2.22.0",
            "v2.21.0",
            "v2.20.0",
            "v2.19.0",
            "v2.18.0",
            "v2.17.0",
            "v2.16.0",
            "v2.15.0",
            "v2.14.1",
            "v2.14.0",
            "v2.13.0",
            "v2.12.0",
            "v2.11.0",
            "v2.10.0",
            "v2.9.1",
            "v2.9.0",
            "v1.107.0",
            "v2.8.0",
            "v2.7.0",
            "v2.6.0",
            "v2.5.1",
            "v2.5.0",
            "v2.4.0",
            "v2.3.0",
            "v2.2.0",
            "v2.1.0",
            "v2.0.0",
            "v1.106.0",
            "v1.105.0",
            "v1.104.0",
            "v1.103.0",
            "v1.102.0",
            "v1.91.0",
            "v1.101.0",
            "v1.100.0",
            "v1.99.0",
            "v1.98.0",
            "v1.97.0",
            "v1.96.0",
            "v1.96.1",
            "v1.94.0",
            "v1.95.1",
            "v1.95.0",
            "v1.93.0",
            "v1.92.0",
            "v1.90.0",
            "v1.89.1",
            "v1.89.0",
            "v1.88.0",
            "v1.87.0",
            "v1.86.0",
            "v1.86.1",
            "v1.85.1",
            "v1.85.0",
            "v1.84.1",
            "v1.84.0",
            "v1.83.0",
            "v1.82.0",
            "v1.81.0",
            "v1.80.0",
            "v1.79.0",
            "v1.78.0",
            "v1.77.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107294.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.389109025Z",
      "provider": "osv",
      "references": [
        "https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.2",
        "https://github.com/pydantic/pydantic-ai/releases/tag/v2.24.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107294.json",
        "https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-v2xh-2vp8-57h8",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-107294",
        "https://github.com/pydantic/pydantic-ai/commit/7a64d049c3f5271a975cd1d64b2fa876d83ede1d",
        "https://github.com/pydantic/pydantic-ai/commit/e3824a58c82864ed26afb2887619834a4eb86cc8",
        "https://github.com/pydantic/pydantic-ai/pull/7141",
        "https://github.com/pydantic/pydantic-ai/pull/7308"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107294.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107294",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497049,
  "published_at": "2026-10-08T16:59:25.246+00:00"
}