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CVE-2025-68664

LangChain Core insecure deserialization

9.3 CRITICALPublic exploitEPSS 42.9%
  1. Published23 Dec 2025

Description

LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, a serialization injection vulnerability exists in LangChain's dumps() and dumpd() functions. The functions do not escape dictionaries with 'lc' keys when serializing free-form dictionaries. The 'lc' key is used internally by LangChain to mark serialized objects. When user-controlled data contains this key structure, it is treated as a legitimate LangChain object during deserialization rather than plain user data. This issue has been patched in versions 0.3.81 and 1.2.5.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

Affected products

LangChain Core≥ 1.0.0 < 1.2.5 · < 0.3.81

Remediation

Fixed in
LangChain Core≥ 1.2.5

References

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Frequently asked

Is CVE-2025-68664 being actively exploited?

CVE-2025-68664 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 42.9%.

How severe is CVE-2025-68664?

CVE-2025-68664 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 42.9% probability of exploitation.

Which products are affected by CVE-2025-68664?

Affected products include LangChain Core.

How do I fix CVE-2025-68664?

Upgrade affected software to a fixed version, for example LangChain Core 1.2.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.