Resource exhaustion in Pydantic Pydantic-Ai
CVE-2026-107294
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.
Vulnerability class: DoS (Denial of Service)
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Pydantic Pydantic-Ai — versions >= 1.77.0, < 1.107.2, >= 2.0.0b1, < 2.24.0
- Pydantic Pydantic-Ai-Slim — versions >= 1.77.0, < 1.107.2, >= 2.0.0b1, < 2.24.0
Weakness classification (CWE)
References
- github.com/pydantic/pydantic-ai/commit/7a64d049c3f5271a975cd1d64b2fa876d83ede1d
- github.com/pydantic/pydantic-ai/commit/e3824a58c82864ed26afb2887619834a4eb86cc8
- github.com/pydantic/pydantic-ai/pull/7141
- github.com/pydantic/pydantic-ai/pull/7308
- github.com/pydantic/pydantic-ai/releases/tag/v1.107.2
- github.com/pydantic/pydantic-ai/releases/tag/v2.24.0
- github.com/pydantic/pydantic-ai/security/advisories/GHSA-v2xh-2vp8-57h8
Frequently asked questions
- What is CVE-2026-107294?
- CVE-2026-107294 is a medium-severity vulnerability in Pydantic Pydantic-Ai, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-10-08.
- How severe is CVE-2026-107294?
- Medium severity. CVSS v3 base score is 6.5 out of 10.