CVE Explorer
CVE-2026-27794
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 i
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"langgraph-checkpoint","vendor":"langchain-ai","versions":[{"status":"affected","version":"< 4.0.0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:e5b2fa0864107189e4583f6cd6d1a9264111760a2fc9e25c719497d68efb0670 · sha256:d79568dc7e4c313e… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.6,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:e5b2fa0864107189e4583f6cd6d1a9264111760a2fc9e25c719497d68efb0670 · sha256:d79568dc7e4c313e… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-502","description":"CWE-502: Deserialization of Untrusted Data","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:e5b2fa0864107189e4583f6cd6d1a9264111760a2fc9e25c719497d68efb0670 · sha256:d79568dc7e4c313e… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"name":"https://github.com/langchain-ai/langgraph/commit/f91d79d0c86932ded6e3b9f195d5a0bbd5aef99c","tags":["x_refsource_MISC"],"url":"https://github.com/langchain-ai/langgraph/commit/f91d79d0c86932ded6e3b9f195d5a0bbd5aef99c"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e5b2fa0864107189e4583f6cd6d1a9264111760a2fc9e25c719497d68efb0670 · sha256:d79568dc7e4c313e… · /containers/cna/references/2
{"name":"https://github.com/langchain-ai/langgraph/pull/6677","tags":["x_refsource_MISC"],"url":"https://github.com/langchain-ai/langgraph/pull/6677"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e5b2fa0864107189e4583f6cd6d1a9264111760a2fc9e25c719497d68efb0670 · sha256:d79568dc7e4c313e… · /containers/cna/references/1
{"name":"https://github.com/langchain-ai/langgraph/releases/tag/checkpoint%3D%3D4.0.0","tags":["x_refsource_MISC"],"url":"https://github.com/langchain-ai/langgraph/releases/tag/checkpoint%3D%3D4.0.0"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e5b2fa0864107189e4583f6cd6d1a9264111760a2fc9e25c719497d68efb0670 · sha256:d79568dc7e4c313e… · /containers/cna/references/3
{"name":"https://github.com/langchain-ai/langgraph/security/advisories/GHSA-mhr3-j7m5-c7c9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/langchain-ai/langgraph/security/advisories/GHSA-mhr3-j7m5-c7c9"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e5b2fa0864107189e4583f6cd6d1a9264111760a2fc9e25c719497d68efb0670 · sha256:d79568dc7e4c313e… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.