Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv6 zone identifier (incomplete fix for CVE-2026-46678 and CVE-2026-48782)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107289
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-08 16:17:04 UTC
Updated2026-10-08 17:17:14 UTC
DescriptionPydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.56.0 until 1.107.6 and 2.44.0, applications that opt attacker-influenced URLs into local network access through FileUrl with force_download='allow-local' or web_fetch_tool with allow_local_urls=True can bypass the cloud-metadata blocklist by appending an IPv6 zone identifier to an IPv6 metadata address. IPv6Address equality and hashing include the zone identifier, so the blocklist comparison fails even though the network stack ignores the zone on a non-link-local destination and reaches the metadata service, potentially exposing cloud IAM credentials. The opt-in settings are disabled by default, and the issue requires an IPv6-enabled environment. This issue is fixed in versions 1.107.6 and 2.44.0.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

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

Problem Types: CWE-918 | CWE-1289 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF) | CWE-1289 CWE-1289: Improper Validation of Unsafe Equivalence in Input

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Pydantic Pydantic-ai affected >= 1.56.0, < 1.107.6 Not specified
CNA Pydantic Pydantic-ai affected >= 2.0.0b1, < 2.44.0 Not specified
CNA Pydantic Pydantic-ai-slim affected >= 1.56.0, < 1.107.6 Not specified
CNA Pydantic Pydantic-ai-slim affected >= 2.0.0b1, < 2.44.0 Not specified

References

ReferenceSourceLinkTags
github.com/pydantic/pydantic-ai/commit/4da70591460f51a8c4f128eaeef70a333... [email protected] github.com
github.com/pydantic/pydantic-ai/releases/tag/v2.44.0 [email protected] github.com
github.com/pydantic/pydantic-ai/pull/8402 [email protected] github.com
github.com/pydantic/pydantic-ai/pull/8401 [email protected] github.com
github.com/pydantic/pydantic-ai/security/advisories/GHSA-vmxc-h2x2-jmf3 [email protected] github.com
github.com/pydantic/pydantic-ai/commit/02157e1b87bd45d3f2e111ce07afdf89f... [email protected] github.com
github.com/pydantic/pydantic-ai/releases/tag/v1.107.6 [email protected] github.com
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