CVE-2026-107288
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
Pydantic AI: web_fetch_tool blocked_domains bypass via a hostname the resolver normalizes differently
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
pydantic-ai
- Vendor
- pydantic
- Product
- pydantic-ai
- Platforms
- Unknown
- Default status
Unknown
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| >= 1.77.0, < 1.107.6 | affected | Unavailable | Unavailable | Unavailable | None listed |
| >= 2.0.0b1, < 2.44.0 | affected | Unavailable | Unavailable | Unavailable | None listed |
pydantic-ai-slim
- Vendor
- pydantic
- Product
- pydantic-ai-slim
- Platforms
- Unknown
- Default status
Unknown
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| >= 1.77.0, < 1.107.6 | affected | Unavailable | Unavailable | Unavailable | None listed |
| >= 2.0.0b1, < 2.44.0 | affected | Unavailable | Unavailable | Unavailable | None listed |