🔐 CVE Alert

CVE-2026-107294

MEDIUM 6.5

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

CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th

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.

CWE CWE-400
Vendor pydantic
Product pydantic-ai
Published Oct 8, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Affected Versions

pydantic / pydantic-ai
>= 1.77.0, < 1.107.2 >= 2.0.0b1, < 2.24.0
pydantic / pydantic-ai-slim
>= 1.77.0, < 1.107.2 >= 2.0.0b1, < 2.24.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗
github.com: https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-v2xh-2vp8-57h8 github.com: https://github.com/pydantic/pydantic-ai/pull/7141 github.com: https://github.com/pydantic/pydantic-ai/pull/7308 github.com: https://github.com/pydantic/pydantic-ai/commit/7a64d049c3f5271a975cd1d64b2fa876d83ede1d github.com: https://github.com/pydantic/pydantic-ai/commit/e3824a58c82864ed26afb2887619834a4eb86cc8 github.com: https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.2 github.com: https://github.com/pydantic/pydantic-ai/releases/tag/v2.24.0