CVE-2026-107294Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Oct 9, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
pydantic pydantic-ai pydantic:ai (from the name) | from 1.77.0, < 1.107.2; from 2.0.0b1, < 2.24.0 | CNA record |
pydantic pydantic-ai-slim pydantic:ai_slim (from the name) | from 1.77.0, < 1.107.2; from 2.0.0b1, < 2.24.0 | CNA record |
pydantic pydantic_ai pydantic:pydantic_ai | from 1.77.0 before 1.107.2; from 2.0.0 before 2.24.0 | NVD |
References
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-v2xh-2vp8-57h8x-refsource-confirm, vendor-advisory
- https://github.com/pydantic/pydantic-ai/pull/7141x-refsource-misc, patch, issue-tracking
- https://github.com/pydantic/pydantic-ai/pull/7308x-refsource-misc, patch, issue-tracking
- https://github.com/pydantic/pydantic-ai/commit/7a64d049c3f5271a975cd1d64b2fa876d83ede1dx-refsource-misc, patch
- https://github.com/pydantic/pydantic-ai/commit/e3824a58c82864ed26afb2887619834a4eb86cc8x-refsource-misc, patch
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.2x-refsource-misc, patch, release-notes
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.24.0x-refsource-misc, patch, release-notes, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.