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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107294
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-08 17:17:15 UTC
Updated2026-10-08 17:17:15 UTC
DescriptionPydantic 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-400 | CWE-400 CWE-400: Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Pydantic Pydantic-ai affected >= 1.77.0, < 1.107.2 Not specified
CNA Pydantic Pydantic-ai affected >= 2.0.0b1, < 2.24.0 Not specified
CNA Pydantic Pydantic-ai-slim affected >= 1.77.0, < 1.107.2 Not specified
CNA Pydantic Pydantic-ai-slim affected >= 2.0.0b1, < 2.24.0 Not specified

References

ReferenceSourceLinkTags
github.com/pydantic/pydantic-ai/pull/7308 [email protected] github.com
github.com/pydantic/pydantic-ai/security/advisories/GHSA-v2xh-2vp8-57h8 [email protected] github.com
github.com/pydantic/pydantic-ai/releases/tag/v2.24.0 [email protected] github.com
github.com/pydantic/pydantic-ai/pull/7141 [email protected] github.com
github.com/pydantic/pydantic-ai/releases/tag/v1.107.2 [email protected] github.com
github.com/pydantic/pydantic-ai/commit/e3824a58c82864ed26afb2887619834a4... [email protected] github.com
github.com/pydantic/pydantic-ai/commit/7a64d049c3f5271a975cd1d64b2fa876d... [email protected] github.com
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