CVE-2026-107294: Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl
Vulnerability summary
CVE-2026-107294 is a medium (CVSS 6.5) Uncontrolled Resource Consumption vulnerability in pydantic pydantic_ai. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 38% of scored vulnerabilities.
Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Timeline
- 08-10-2026PublishedVulnerability first disclosed.
- 09-10-2026Last modifiedVulnerability information updated.
Description
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 metrics
3 scores · 3 sources · 1 version- OSV · PypiEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVDNIST6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.44%
Chance of exploitation in the next 30 days
Percentile
38%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Pydantic3 products
- pydantic_ai≥ 1.77.0, < 1.107.2 | ≥ 2.0.0, < 2.24.0
- pydantic-ai≥ 1.77.0, < 1.107.2 | ≥ 2.0.0b1, < 2.24.0
- pydantic-ai-slim≥ 1.77.0, < 1.107.2 | ≥ 2.0.0b1, < 2.24.0
PyPI2 products
- pydantic-ai≥ 1.77.0, < 1.107.2 | ≥ 2.0.0b1, < 2.24.0
- pydantic-ai-slim≥ 1.77.0, < 1.107.2 | ≥ 2.0.0b1, < 2.24.0
2 vendors · 5 products
References
12 links- github.com/pydantic/pydantic-ai/security/advisories/GHSA-v2xh-2vp8-57h8X Refsource CONFIRMWEBVendor Advisory
- github.com/pydantic/pydantic-ai/commit/7a64d049c3f5271a975cd1d64b2fa876d83ede1dX Refsource MISCWEBPatch
- github.com/pydantic/pydantic-ai/commit/e3824a58c82864ed26afb2887619834a4eb86cc8X Refsource MISCWEBPatch
- github.com/pydantic/pydantic-ai/releases/tag/v2.24.0X Refsource MISCWEBPatchRelease NotesVendor Advisory
- pypi.org/project/pydantic-aiPACKAGE
