CVE-2026-25640 - Pydantic AI is a Python agent framework for building applications and workflows with Generative AI

CVE-2026-25640 + Pydantic AI is a Python agent framework for building applications and workflows with Generative AI + High + 2026-02-06

One-sentence business risk

Attackers can turn a normal application path into code execution, making this a direct production-host takeover risk.

Research notes

  • Root cause: Pydantic AI is a Python agent framework for building applications and workflows with Generative AI.
  • Affected versions: before 1.
  • Fixed / safe versions: version query parameter from the request URL. This parameter is not.
  • Public exploit / PoC signal: the consulted NVD/GHSA/vendor sources describe the trigger class; treat it as reproducible until patched.
  • CVSS: 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N.

Exact vulnerable code pattern

run("tool " + user_controlled_value)

Fixed / mitigated code pattern

run(["tool", user_controlled_value], shell=False) with an allowlisted argument schema

Dependency or runtime update:

npm ls affected component || true
npm install affected component@latest --save-exact
npm audit --omit=dev

Step-by-step integration guide

  1. Inventory affected component across source, lockfiles, SBOMs, container images, CI images, and deployment manifests.
  2. Upgrade to version query parameter from the request URL. This parameter is not or apply the exact vendor patch referenced below.
  3. Replace the vulnerable command-injection pattern with the fixed pattern and fail closed on malformed input.
  4. Add a regression test that exercises the advisory trigger and proves the request is rejected, bounded, or authorized.
  5. Deploy through canary, monitor security logs and resource metrics, then remove temporary edge blocks only after all runtimes are fixed.

Alternative mitigations

  • Disable the vulnerable feature path while the package/runtime update rolls out.
  • Add WAF or reverse-proxy rules for traversal tokens, prototype-polluting keys, oversized frames, shell metacharacters, or unauthenticated tool calls matching the trigger class.
  • Restrict internal egress, rotate exposed secrets, and revoke affected tokens/keys if the vulnerability can disclose config, logs, JWT secrets, proxy credentials, or PKI material.
  • For admin/API authorization issues, temporarily require elevated roles and explicit ownership checks at the gateway.

Detection signature

id: cve-2026-25640-pydantic-ai-is-a-python-agent-framework-for-buil
source: NVD bulk JSON feed
dependency_or_product: "affected component"
affected: "before 1"
fixed: "version query parameter from the request URL. This parameter is not"
signals:
  - "command-injection"
  - "../"
  - "__proto__"
  - "tools/call"
  - "wp_ajax_nopriv"
  - "pickle.loads"
  - "shell command construction"
action: "upgrade, add regression test, and verify deploy artifact"

Copy-paste skill

You are remediating CVE-2026-25640 (Pydantic AI is a Python agent framework for building applications and workflows with Generative AI) in this repository.

Find every affected dependency, runtime, image, service configuration, and reachable code path. Upgrade or patch to version query parameter from the request URL. This parameter is not. Replace the vulnerable command-injection pattern with a fail-closed implementation, add a regression test for the trigger shape, and update deployment/SBOM artifacts. If this repository does not control the affected runtime, create TRIAGE.md naming the owner, affected version, fixed version, and blocking decision.

Keywords, affected tech stack, and revenue tags

  • Keywords: CVE-2026-25640, command-injection, affected component, NVD bulk JSON feed.
  • Affected tech stack: javascript/npm.
  • Revenue tags: sellable_to_fintech, enterprise_blocker, high_priority_sla.

References