Medium 6.5Published Oct 8, 2026

CVE-2026-107294Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl

Updated under an hour ago (Oct 27, 2026, 7:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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

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

References

https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-v2xh-2vp8-57h8	x-refsource-confirm, vendor-advisory
https://github.com/pydantic/pydantic-ai/pull/7141	x-refsource-misc, patch, issue-tracking
https://github.com/pydantic/pydantic-ai/pull/7308	x-refsource-misc, patch, issue-tracking
https://github.com/pydantic/pydantic-ai/commit/7a64d049c3f5271a975cd1d64b2fa876d83ede1d	x-refsource-misc, patch
https://github.com/pydantic/pydantic-ai/commit/e3824a58c82864ed26afb2887619834a4eb86cc8	x-refsource-misc, patch
https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.2	x-refsource-misc, patch, release-notes
https://github.com/pydantic/pydantic-ai/releases/tag/v2.24.0	x-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.