What is CVE-2026-28277?

CVE-2026-28277 is a medium-severity vulnerability in Langchain Langgraph, classified under Deserialization of Untrusted Data. CVSS score: 6.8/10. Published 2026-03-05.

How severe is CVE-2026-28277?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Deserialization in Langchain Langgraph

CVE-2026-28277

LangGraph SQLite Checkpoint is an implementation of LangGraph CheckpointSaver that uses SQLite DB (both sync and async, via aiosqlite). In version 1.0.9 and prior, LangGraph checkpointers can load msgpack-encoded checkpoints that reconstru…

Vulnerability class: Insecure Deserialization

EPSS: 0.004 (33.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Langchain Langgraph
Langchain-ai Langgraph — versions <= 1.0.9

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-28277?: CVE-2026-28277 is a medium-severity vulnerability in Langchain Langgraph, classified under Deserialization of Untrusted Data. CVSS score: 6.8/10. Published 2026-03-05.
How severe is CVE-2026-28277?: Medium severity. CVSS v3 base score is 6.8 out of 10.