CVE-2026-107291: low-severity vulnerability in pydantic-ai
Pydantic AI OpenTelemetry instrumentation: exception events on tool and agent run spans include content when `include_content=False`
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 2.3epss 0.6%
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.
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
Related CVEs — pydantic-ai
In the same product, most dangerous first.
CVE-2026-25580HIGHPydantic AI Affected by Server-Side Request Forgery (SSRF) in URL Download HandlingEPSS 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%CVE-2026-107289MEDIUMPydantic AI: SSRF cloud-metadata blocklist bypass via IPv6 zone identifier (incomplete fix for CVE-2026-46678 and CVE-2026-48782)EPSS 0.4%
References
https://github.com/pydantic/pydantic-ai/commit/4e013c51a50659aba2adf7853bfb22bb77f6a518https://github.com/pydantic/pydantic-ai/commit/6b14c74cb281f899a2ae4fae5327111e33f60771https://github.com/pydantic/pydantic-ai/commit/7ee27e38ab2e525ca60ff1a25d16413ff989fd79https://github.com/pydantic/pydantic-ai/commit/963dec5f70d6f558997fc259356c0090cc5ea487https://github.com/pydantic/pydantic-ai/commit/de4e61515327bd80a19cd8552001c30933e6acc3https://github.com/pydantic/pydantic-ai/pull/8403https://github.com/pydantic/pydantic-ai/pull/8404https://github.com/pydantic/pydantic-ai/pull/8408https://github.com/pydantic/pydantic-ai/pull/8428https://github.com/pydantic/pydantic-ai/pull/8429https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0