CVE-2026-107289mediumCWE-1289CWE-918

CVE-2026-107289: fallo de gravedad media en pydantic-ai

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

Publicada el

Seguir esta CVE+ Monitorear pydantic-ai+ Monitorear pydantic-ai-slim

Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.

13Vexday Risk Score

Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.

ssvc Trackcvss 6.8epss 0.4%
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:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Productos afectados
pydantic · pydantic-aipydantic · pydantic-ai-slim
CVEs relacionadas — pydantic-ai

En el mismo producto, de las más peligrosas a las menos.

CVE-2026-25580HIGHPydantic AI Affected by Server-Side Request Forgery (SSRF) in URL Download HandlingEPSS 0.6%CVE-2026-107291LOWPydantic AI OpenTelemetry instrumentation: exception events on tool and agent run spans include content when `include_content=False`EPSS 0.6%CVE-2026-107290MEDIUMPydantic AI: Event loop blocked by quadratic title extraction in `web_fetch`EPSS 0.5%CVE-2026-107286HIGHPydantic AI: Concurrency-limited models can keep their slot when a streamed request ends earlyEPSS 0.4%CVE-2026-107294MEDIUMPydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrlEPSS 0.4%CVE-2026-48782MEDIUMpydantic-ai: SSRF blocklist bypass via IPv4-compatible, SIIT/IVI, and local NAT64 IPv6 addresses (incomplete fix of CVE-2026-46678)EPSS 0.4%