CVE-2026-107288

low

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI.

Vendor / product: Pydantic — pydantic ai

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.6 and 2.44.0, the local web_fetch_tool and the WebFetch local fallback compare blocked_domains entries with a URL hostname before both values are normalized to the form used by getaddrinfo. An attacker-influenced model can use an equivalent IDNA spelling, non-ASCII label separator, case variation, or trailing root label that resolves to a blocked host but does not match the configured string, causing the application to fetch that host with its own privileges. allowed_domains fails closed for unmatched spellings, and private-IP and cloud-metadata protections remain effective. This issue is fixed in versions 1.107.6 and 2.44.0.

CVSS

3.7

3.7 (CVSS v3.1)

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Severity source: NVD CVSS v3.1 (security-advisories@github.com)

Timeline (UTC)

Published: 2026-10-08 16:17

Modified: 2026-10-13 14:35

NVD status: Analyzed

Last synced 2 days ago

Verified against the source API 2026-10-27 06:58 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

pydantic / pydantic_ai ≥1.77.0 <1.107.6, ≥2.0.0 <2.44.0

Weakness classification (CWE)

CWE-918 CWE-1289

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://github.com/pydantic/pydantic-ai/pull/8407

Vendor advisory: https://github.com/pydantic/pydantic-ai/pull/8409

Vendor advisory: https://github.com/pydantic/pydantic-ai/pull/8421

Vendor advisory: https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6

Vendor advisory: https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0

Vendor advisory: https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-22h6-qm39-v87j

Patch / mitigation: https://github.com/pydantic/pydantic-ai/commit/490335f8e2322e143a79337ddca9410e0176c812

Patch / mitigation: https://github.com/pydantic/pydantic-ai/commit/a9dab92099d0ef9d5d4aa34ccac8a6f1b0e51284

Patch / mitigation: https://github.com/pydantic/pydantic-ai/commit/c1f212a084cbfa0012f2044cdb4731d214b3b983

Patch / mitigation: https://github.com/pydantic/pydantic-ai/pull/8407

Patch / mitigation: https://github.com/pydantic/pydantic-ai/pull/8409

Patch / mitigation: https://github.com/pydantic/pydantic-ai/pull/8421

Patch / mitigation: https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6

Patch / mitigation: https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0

Patch / mitigation: https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-22h6-qm39-v87j

References

https://github.com/pydantic/pydantic-ai/commit/490335f8e2322e143a79337ddca9410e0176c812 security-advisories@github.com
https://github.com/pydantic/pydantic-ai/commit/a9dab92099d0ef9d5d4aa34ccac8a6f1b0e51284 security-advisories@github.com
https://github.com/pydantic/pydantic-ai/commit/c1f212a084cbfa0012f2044cdb4731d214b3b983 security-advisories@github.com
https://github.com/pydantic/pydantic-ai/pull/8407 security-advisories@github.com
https://github.com/pydantic/pydantic-ai/pull/8409 security-advisories@github.com
https://github.com/pydantic/pydantic-ai/pull/8421 security-advisories@github.com
https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6 security-advisories@github.com
https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0 security-advisories@github.com
https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-22h6-qm39-v87j security-advisories@github.com

Data sources

NVD CVE API 2.0 — fetched 2026-10-27 06:58 UTC · record ↗

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CVE-2026-107288

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