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Pydantic-AI library leaked sensitive tokens despite security flags

By PulseAugur Editorial · [1 sources] ·

A security vulnerability in the pydantic-ai library allowed sensitive information, including server URLs and authorization tokens, to be leaked in plaintext within OpenTelemetry spans. This occurred even when the `include_content=False` flag was set, which was intended to prevent such data from being logged. The vulnerability was reproducible without network access by using a stub model, demonstrating that the issue lay within the library's instrumentation code. Pydantic-ai has since released security fixes to address this data leakage. AI

IMPACT This vulnerability highlights the need for robust security practices in AI development tools to prevent sensitive data exposure.

RANK_REASON The item discusses a specific vulnerability and fix within a software library, not a core AI model release or research.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Pydantic-AI library leaked sensitive tokens despite security flags

How we ranked this

Signal score
27 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
The item discusses a specific vulnerability and fix within a software library, not a core AI model release or research.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
product, safety
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Mike Moore ·

    include_content=False Didn't Stop pydantic-ai's MCP Token Leak

    <p><em>Originally published at <a href="https://webofmike.com/pydantic-ai-mcp-telemetry-leak/?utm_source=devto&amp;utm_medium=syndication&amp;utm_campaign=pydantic-ai-mcp-telemetry-leak" rel="noopener noreferrer">webofmike.com</a> on 2026-10-26. The demo repo and every command in…

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