EUVD-2026-95075

Pydantic AI: Excessive resource use when local web fetching converts nested HTML...

GHSA-H4XC-3QFQ-JF93 Pydantic AI Web chat UI (`Agent.to_web()`, `clai web`): a website visited by the developer can trigger agent runs and server-side tool execution on the local chat endpoint

Summary The Pydantic AI development web chat UI Agent.toweb, clai web did not check the content type of requests to its chat endpoint. This allowed a website visited by a developer to submit a request to a chat UI running on that developer's machine, causing the served agent to run and to execute...

CVE-2026-107295 `pydantic-ai-slim` web UI `/api/chat` accepts browser-simple cross-origin requests that can trigger agent tool execution

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.34.0 until 1.107.4 and 2.28.0, the Agent.toweb and clai web development chat endpoint has missing request content-type validation. A website visited by a developer can submit a...

CVE-2026-107294 Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.2 and 2.24.0, webfetchtool, the WebFetch local fallback, and remote FileUrl media downloads buffer the complete HTTP response body before enforcing content-size controls. An...

CVE-2026-107293 Pydantic AI OpenTelemetry instrumentation: retry prompt content is not redacted when `include_content=False`

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 0.3.4 until 1.107.4 and 2.27.1, OpenTelemetry instrumentation configured with InstrumentationSettingsincludecontent=False can export retry prompts outside tool calls in genai.input.messages an...

CVE-2026-107293

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 0.3.4 until 1.107.4 and 2.27.1, OpenTelemetry instrumentation configured with InstrumentationSettingsincludecontent=False can export retry prompts outside tool calls in genai.input.messages an...

CVE-2026-107292 Pydantic AI Web chat UI (`Agent.to_web()`, `clai web`): the local chat endpoint does not validate the `Host` header

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.34.0 until 2.30.0, the Agent.toweb and clai web development chat server does not validate the Host header, allowing a website visited by a developer to use DNS rebinding to reach a...

CVE-2026-107292

The Pydantic AI Python agent framework is vulnerable in versions 1.34.0 through 2.30.0 due to a lack of Host header validation in the Agent.to_web() and clai web development chat servers. An attacker can leverage DNS rebinding from a malicious website to bypass Origin checks and CSRF tokens , acc...

CVE-2026-107291 Pydantic AI OpenTelemetry instrumentation: exception events on tool and agent run spans include content when `include_content=False`

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 0.3.4 until 1.107.6 and 2.44.0, OpenTelemetry instrumentation configured with InstrumentationSettingsincludecontent=False can still export sensitive agent content through exception.message and...

CVE-2026-107291

The Pydantic AI Python agent framework is vulnerable to sensitive information disclosure in versions 0.3.4 through 1.107.6 and 2.44.0 . When OpenTelemetry instrumentation is configured with include_content=False, the system fails to redact sensitive agent content from exception.message and except...

CVE-2026-107288

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 webfetchtool and the WebFetch local fallback compare blockeddomains entries with a URL hostname before both values are normalized to the form used by...

CVE-2026-107289

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 forcedownload='allow-local' or webfetchtool with...

CVE-2026-107287

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.7 and 2.52.0, the local webfetchtool and the WebFetch local fallback can consume excessive CPU and memory during HTML-to-Markdown conversion of attacker-controlled HTML...

CVE-2026-107290

The Pydantic AI Python agent framework is vulnerable to a denial-of-service condition in the local web_fetch_tool and the WebFetch local fallback process. Specifically, versions 1.77.0 to 1.107.6 and 2.44.0 exhibit quadratic title extraction , whitespace normalization, and ordered-list numbering ...

CVE-2026-107290 Pydantic AI: Event loop blocked by quadratic title extraction in `web_fetch`

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 webfetchtool and the WebFetch local fallback process server-controlled responses with quadratic title extraction, whitespace normalization, and...

CVE-2026-107289 Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv6 zone identifier (incomplete fix for CVE-2026-46678 and CVE-2026-48782)

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 forcedownload='allow-local' or webfetchtool with...

EUVD-2026-95077

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 forcedownload='allow-local' or webfetchtool with...

CVE-2026-107289

The Pydantic AI Python agent framework is vulnerable to Server-Side Request Forgery (SSRF) in versions 1.56.0 through 1.107.5 and 2.44.0. When users opt-in to local network access via FileUrl (with force_download='allow-local') or web_fetch_tool (with allow_local_urls=True), an attacker can bypas...

CVE-2026-107288 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 webfetchtool and the WebFetch local fallback compare blockeddomains entries with a URL hostname before both values are normalized to the form used by...

CVE-2026-107288

The Pydantic AI Python agent framework versions 1.77.0 through 1.107.6 and 2.44.0 are vulnerable to a Server-Side Request Forgery (SSRF) . The root cause is that the web_fetch_tool and WebFetch local fallback compare blocked_domains entries against a URL hostname before both values are normalized...