Deserialization of Untrusted Data Affecting py3-langchain package, versions <1.3.4-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published3 Jun 2026
- disclosed26 May 2026
Introduced: 26 May 2026
CVE-2026-44843 (opens in a new tab)How to fix?
Upgrade Wolfi py3-langchain to version 1.3.4-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream py3-langchain package and not the py3-langchain package as distributed by Wolfi.
See How to fix? for Wolfi relevant fixed versions and status.
LangChain is a framework for building agents and LLM-powered applications. Prior to 0.3.85 and 1.3.3, LangChain contains older runtime code paths that deserialize run inputs, run outputs, or other application-controlled payloads using overly broad object allowlists. These paths may call load() with allowed_objects="all". This does not enable arbitrary Python object deserialization, but it does allow any trusted LangChain-serializable object to be revived, which is broader than these runtime paths require. As a result, attacker-supplied LangChain serialized constructor dictionaries may cause trusted runtime paths to instantiate classes with untrusted constructor arguments. This vulnerability is fixed in 0.3.85 and 1.3.3.