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Sunday, 13 September 2026
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Incident database

LangChain and LangSmith SDK unsafe deserialization of untrusted serialized objects

LangChain versions before 0.3.85 and 1.3.3 deserialized application-controlled payloads using overly broad object allowlists, letting attacker-supplied serialized constructor dictionaries instantiate trusted LangChain classes with untrusted arguments. A related issue in the LangSmith SDKs (before Python 0.8.0 and JS/TS 0.6.0) meant prompt pull methods deserialized externally controlled public prompt manifests without distinguishing them from prompts owned by the caller's organization.

Disclosed 26 May 2026 · Record updated 13 September 2026

Impact

Attacker-controlled serialized payloads or public prompt manifests could cause trusted runtime paths to revive LangChain-serializable objects with untrusted constructor arguments, influencing runtime behaviour and model configuration.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-44843
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-45134