LangGraph Checkpoint defines the base interface for LangGraph checkpointers. Prior to version 4.0.0, a Remote Code Execution vulnerability exists in LangGraph's caching layer when applications enable cache backends that inherit from `BaseCache` and opt nodes into caching via `CachePolicy`. Prior to `langgraph-checkpoint` 4.0.0, `BaseCache` defaults to `JsonPlusSerializer(pickle_fallback=True)`. When msgpack serialization fails, cached values can be deserialized via `pickle.loads(...)`. Caching is not enabled by default. Applications are affected only when the application explicitly enables a cache backend (for example by passing `cache=...` to `StateGraph.compile(...)` or otherwise configuring a `BaseCache` implementation), one or more nodes opt into caching via `CachePolicy`, and the attacker can write to the cache backend (for example a network-accessible Redis instance with weak/no auth, shared cache infrastructure reachable by other tenants/services, or a writable SQLite cache file). An attacker must be able to write attacker-controlled bytes into the cache backend such that the LangGraph process later reads and deserializes them. This typically requires write access to a networked cache (for example a network-accessible Redis instance with weak/no auth or shared cache infrastructure reachable by other tenants/services) or write access to local cache storage (for example a writable SQLite cache file via permissive file permissions or a shared writable volume). Because exploitation requires write access to the cache storage layer, this is a post-compromise / post-access escalation vector. LangGraph Checkpoint 4.0.0 patches the issue.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - LangGraph Checkpoint defines the base interface for LangGraph checkpointers. Prior to version 4.0.0, a
    Remote Code Execution vulnerability exists in LangGraph's caching layer when applications enable cache
    backends that inherit from `BaseCache` and opt nodes into caching via `CachePolicy`. Prior to `langgraph-
    checkpoint` 4.0.0, `BaseCache` defaults to `JsonPlusSerializer(pickle_fallback=True)`. When msgpack
    serialization fails, cached values can be deserialized via `pickle.loads(...)`. Caching is not enabled by
    default. Applications are affected only when the application explicitly enables a cache backend (for
    example by passing `cache=...` to `StateGraph.compile(...)` or otherwise configuring a `BaseCache`
    implementation), one or more nodes opt into caching via `CachePolicy`, and the attacker can write to the
    cache backend (for example a network-accessible Redis instance with weak/no auth, shared cache
    infrastructure reachable by other tenants/services, or a writable SQLite cache file). An attacker must be
    able to write attacker-controlled bytes into the cache backend such that the LangGraph process later reads
    and deserializes them. This typically requires write access to a networked cache (for example a network-
    accessible Redis instance with weak/no auth or shared cache infrastructure reachable by other
    tenants/services) or write access to local cache storage (for example a writable SQLite cache file via
    permissive file permissions or a shared writable volume). Because exploitation requires write access to
    the cache storage layer, this is a post-compromise / post-access escalation vector. LangGraph Checkpoint
    4.0.0 patches the issue. (CVE-2026-27794)

ID	Name	Product	Family	Type	Severity
459634	Echo: langgraph-checkpoint: security update to 4.0.0	Tenable Cloud Security	Echo Local Security Checks	Local	medium
459634	Echo: langgraph-checkpoint: security update to 4.0.0	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
438063	SCA: security update for langgraph-checkpoint (GHSA-mhr3-j7m5-c7c9)	Tenable Cloud Security	SCA Checks	Local	medium
438063	SCA: security update for langgraph-checkpoint (GHSA-mhr3-j7m5-c7c9)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-27794

medium

Tenable Plugins

medium

medium

medium

medium