{"cve":"CVE-2026-27794","nvd":{"published":"2026-02-25T18:23:40.980","modified":"2026-06-17T10:27:41.647","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","score":6.6},"cwes":["CWE-502"],"references":["https://github.com/langchain-ai/langgraph/commit/f91d79d0c86932ded6e3b9f195d5a0bbd5aef99c","https://github.com/langchain-ai/langgraph/pull/6677","https://github.com/langchain-ai/langgraph/releases/tag/checkpoint%3D%3D4.0.0","https://github.com/langchain-ai/langgraph/security/advisories/GHSA-mhr3-j7m5-c7c9"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:24:17.937441719+00:00"},"epss":{"cve":"CVE-2026-27794","score":0.00836,"percentile":0.57745,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mhr3-j7m5-c7c9","url":"https://osv.dev/vulnerability/GHSA-mhr3-j7m5-c7c9","summary":"LangGraph: BaseCache Deserialization of Untrusted Data may lead to Remote Code Execution ","modified":"2026-07-13T16:43:21.192471528Z","packages":[{"ecosystem":"PyPI","name":"langgraph-checkpoint","purl":"pkg:pypi/langgraph-checkpoint","ranges":["<4.0.0"],"fixed":["4.0.0"]}]},{"id":"PYSEC-2026-2574","url":"https://osv.dev/vulnerability/PYSEC-2026-2574","summary":"LangGraph: BaseCache Deserialization of Untrusted Data may lead to Remote Code Execution ","modified":"2026-07-13T16:32:02.140857785Z","packages":[{"ecosystem":"PyPI","name":"langgraph-checkpoint","purl":"pkg:pypi/langgraph-checkpoint","ranges":["<4.0.0"],"fixed":["4.0.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}