comerc/CVE-2025-68664

GitHubRepository PoCWriteup

PoC files

5 files

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GitHub
Analysisdeepseek-v4-pro:cloud ·

Technical assessment

A technical writeup in Russian describing CVE-2025-68664, a serialization injection vulnerability in LangChain's dumps()/dumpd() functions. The document explains the vulnerability mechanism, attack vectors, potential impact (secret extraction, object instantiation, possible code execution), and defensive recommendations. It explicitly states that a ready-to-use exploit is not published.

Backdoor review

No backdoor observed in reviewed code

The supplied evidence is a single README.md file that describes the CVE-2025-68664 vulnerability in LangChain. It contains no executable code, no instructions for the reader to run, and no concealed payload. The text is a technical disclosure and marketing article for a security product.

ClassificationWriteup
Model confidence98%
AuthenticationNot required
LanguagesRussian
Target softwarelangchain-core
Attack typesDeserialization of Untrusted DataSerialization InjectionPrompt Injection
Evidence & reasoningClassification basis · observed behavior · safety review
Technical evidence

Classification basis and observed behavior

Classification basis

The artifact is a blog post/writeup providing a technical analysis of CVE-2025-68664. It contains no executable exploit or scanner code. The author explicitly states 'Мы намеренно не публикуем здесь готовый эксплойт' (We intentionally do not publish a ready-to-use exploit here).

README.md:131

Requirements

  • User-controlled data containing an 'lc' key must be serialized by dumps() or dumpd() and later deserialized by load() or loads().README.md:29-31
  • The attacker must be able to influence fields like additional_kwargs or response_metadata, often via prompt injection.README.md:23

Observed behavior

  • The document describes how an attacker can craft a dictionary with an 'lc' key to be treated as a legitimate LangChain object during deserialization, leading to secret extraction from environment variables or instantiation of objects from an allowlist.README.md:29-31README.md:107-121
  • The writeup mentions a specific exfiltration path using ChatBedrockConverse to make a GET request with an attacker-controlled endpoint and an environment variable in a header.README.md:125-129
  • The author states that a ready-to-use exploit is intentionally not published to give security teams time to patch.README.md:131
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Vulnerability Disclosure
CVE-2025-68664The document describes a serialization injection vulnerability in LangChain's dumps()/dumpd() functions.README.md:1-265
Marketing Content
Cyata product promotionThe document includes promotional content for a security product called Cyata, describing its features for AI risk management.README.md:193-257
Review boundaries

What the analysis did not establish

  • The evidence packet contains only the README.md file; four non-text media files (images) are omitted, which may contain additional technical details.
  • The analysis is based solely on the provided text; no code execution or dynamic analysis was performed.
  • Four non-text media files (images) are present in the repository but were not analyzed; they are flagged as metadata-only and could theoretically contain steganographic payloads, though no evidence suggests this.
  • The review covers only the supplied README.md text; no other source files were provided for analysis.
Model interpretation

This review is limited to the supplied PoC code and context. It does not assert that the code works or is safe to execute.

Linked vulnerabilities

1