[Release] langchain-ai/langchain langchain==1.2.14: langchain==1.2.14

LangChain v1.2.14 release includes security patches, performance improvements, and bug fixes. Key updates address CVE-2026-4539 via Pygments dependency upgrade, reduce initialization speed by 15%, fix recursion limit handling in create_agent, and improve token counter recognition for ChatAnthropicVertex. The release also updates dependencies, adds async implementations, and enhances Azure AI Foundry compatibility.

Key Points

• •Security patch: Upgrade Pygments to >=2.20.0 across all packages to address CVE-2026-4539
• •Performance improvement: 15% reduction in initialization speed
• •Fix recursion limit override in create_agent with added runtime test coverage
• •Recognize ChatAnthropicVertex in token counter approximation logic
• •Bump langchain-core minimum version to 1.2.21 for partners
• •Update cryptography from 46.0.5 to 46.0.6 and requests from 2.32.5 to 2.33.0
• •Add async implementation to todolist middleware with optimized initialization
• •Add missing ModelProfile fields and implement schema drift warnings
• •Update model provider classes for Azure AI Foundry compatibility
• •Fix lint_diff relative paths in package makefiles for build infrastructure

Workflow Diagram

Concepts