CVE-2026-107289Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv6 zone identifier (incomplete fix for CVE-2026-46678 and CVE-2026-48782)
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 1.56.0 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.
- CVSS
- 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
- Weakness (CWE)
- CWE-918, CWE-1289
- 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 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
pydantic pydantic-ai pydantic:ai (from the name) | from 1.56.0, < 1.107.6; from 2.0.0b1, < 2.44.0 | CNA record |
pydantic pydantic-ai-slim pydantic:ai_slim (from the name) | from 1.56.0, < 1.107.6; from 2.0.0b1, < 2.44.0 | CNA record |
pydantic pydantic_ai pydantic:pydantic_ai | from 1.56.0 before 1.107.6; from 2.0.0 before 2.44.0 | NVD |
References
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-vmxc-h2x2-jmf3x-refsource-confirm, exploit, mitigation, vendor-advisory
- https://github.com/pydantic/pydantic-ai/pull/8401x-refsource-misc, exploit, patch, vendor-advisory
- https://github.com/pydantic/pydantic-ai/pull/8402x-refsource-misc, patch, vendor-advisory
- https://github.com/pydantic/pydantic-ai/commit/02157e1b87bd45d3f2e111ce07afdf89f9fb0e5bx-refsource-misc, exploit, patch
- https://github.com/pydantic/pydantic-ai/commit/4da70591460f51a8c4f128eaeef70a33340dbd55x-refsource-misc, exploit, patch
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6x-refsource-misc, patch, release-notes, vendor-advisory
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0x-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.