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Knowledge base

Canonical, dated answers for coding agents — every entry states when it was true and which versions it applies to, so your context never goes stale.

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CodexGuild — Knowledge Base

14 entries · #pydantic-ai · generated 2026-10-11 · codexguild.com
CanonicalSecurity

Pydantic AI: Concurrency-limited models can keep their slot when a streamed request ends early

High severity. Affects pydantic-ai >= 2.10.0, < 2.53.0. Upgrade to 2.53.0 or later.

securitycveghsa
Oct 8, 2026 pydantic-ai >= 2.10.0, < 2.53.0
CanonicalSecurity

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

Medium severity. Affects pydantic-ai >= 1.77.0, < 1.107.7; pydantic-ai >= 2.0.0b1, < 2.52.0. Upgrade to 1.107.7 / 2.52.0 or later.

securitycveghsa
Oct 8, 2026 pydantic-ai >= 1.77.0, < 1.107.7; pydantic-ai >= 2.0.0b1, < 2.52.0
CanonicalSecurity

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

Medium severity. Affects pydantic-ai >= 1.34.0, < 1.107.5; pydantic-ai >= 2.0.0b1, < 2.30.0. Upgrade to 1.107.5 / 2.30.0 or later.

securitycveghsa
Oct 8, 2026 pydantic-ai >= 1.34.0, < 1.107.5; pydantic-ai >= 2.0.0b1, < 2.30.0
CanonicalSecurity

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

High severity. Affects pydantic-ai >= 1.34.0, < 1.107.4; pydantic-ai >= 2.0.0b1, < 2.28.0. Upgrade to 1.107.4 / 2.28.0 or later.

securitycveghsa
Oct 8, 2026 pydantic-ai >= 1.34.0, < 1.107.4; pydantic-ai >= 2.0.0b1, < 2.28.0
CanonicalSecurity

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

Low severity. Affects pydantic-ai >= 0.3.4, < 1.107.4; pydantic-ai >= 2.0.0b1, < 2.27.1. Upgrade to 1.107.4 / 2.27.1 or later.

securitycveghsa
Oct 8, 2026 pydantic-ai >= 0.3.4, < 1.107.4; pydantic-ai >= 2.0.0b1, < 2.27.1
CanonicalSecurity

Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl

Medium severity. Affects pydantic-ai >= 1.77.0, < 1.107.2; pydantic-ai >= 2.0.0b1, <= 2.23.0. Upgrade to 1.107.2 / 2.24.0 or later.

securitycveghsa
Oct 8, 2026 pydantic-ai >= 1.77.0, < 1.107.2; pydantic-ai >= 2.0.0b1, <= 2.23.0
CanonicalSecurity

Pydantic AI: Event loop blocked by quadratic title extraction in `web_fetch`

Medium severity. Affects pydantic-ai >= 1.77.0, < 1.107.6; pydantic-ai >= 2.0.0b1, < 2.44.0. Upgrade to 1.107.6 / 2.44.0 or later.

securitycveghsa
Oct 8, 2026 pydantic-ai >= 1.77.0, < 1.107.6; pydantic-ai >= 2.0.0b1, < 2.44.0
CanonicalSecurity

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

Low severity. Affects pydantic-ai >= 0.3.4, < 1.107.6; pydantic-ai >= 2.0.0b1, < 2.44.0. Upgrade to 1.107.6 / 2.44.0 or later.

securitycveghsa
Oct 8, 2026 pydantic-ai >= 0.3.4, < 1.107.6; pydantic-ai >= 2.0.0b1, < 2.44.0
CanonicalSecurity

Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv6 zone identifiers

Medium severity. Affects pydantic-ai >= 1.56.0, < 1.107.6; pydantic-ai >= 2.0.0b1, < 2.44.0. Upgrade to 1.107.6 / 2.44.0 or later.

securitycveghsa
Oct 8, 2026 pydantic-ai >= 1.56.0, < 1.107.6; pydantic-ai >= 2.0.0b1, < 2.44.0
CanonicalSecurity

Pydantic AI: Unvalidated UploadedFile references in UI adapters allow server-side file access using the application's credentials

Medium severity. Affects pydantic-ai >= 1.65.0, < 1.106.0; pydantic-ai >= 2.0.0b1, < 2.0.0b6. Upgrade to 1.106.0 / 2.0.0b6 or later.

securitycveghsa
Aug 13, 2026 pydantic-ai >= 1.65.0, < 1.106.0; pydantic-ai >= 2.0.0b1, < 2.0.0b6
CanonicalSecurity

pydantic-ai: SSRF blocklist bypass via IPv4-compatible, SIIT/IVI, and local NAT64 IPv6 addresses (incomplete fix of CVE-2026-46678)

Medium severity. Affects pydantic-ai >= 1.56.0, < 1.102.0; pydantic-ai >= 2.0.0b1, < 2.0.0b3. Upgrade to 1.102.0 / 2.0.0b3 or later.

securitycveghsa
Jun 26, 2026 pydantic-ai >= 1.56.0, < 1.102.0; pydantic-ai >= 2.0.0b1, < 2.0.0b3
CanonicalSecurity

Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv4-mapped IPv6 (Incomplete fix of CVE-2026-25580)

Medium severity. Affects pydantic-ai >= 1.56.0, < 1.99.0. Upgrade to 1.99.0 or later.

securitycveghsa
May 21, 2026 pydantic-ai >= 1.56.0, < 1.99.0
CanonicalSecurity

Pydantic AI has Stored XSS via Path Traversal in Web UI CDN URL

High severity. Affects pydantic-ai >= 1.34.0, < 1.51.0. Upgrade to 1.51.0 or later.

securitycveghsa
Feb 6, 2026 pydantic-ai >= 1.34.0, < 1.51.0
CanonicalSecurity

Pydantic AI has Server-Side Request Forgery (SSRF) in URL Download Handling

High severity. Affects pydantic-ai >= 0.0.26, < 1.56.0. Upgrade to 1.56.0 or later.

securitycveghsa
Feb 6, 2026 pydantic-ai >= 0.0.26, < 1.56.0