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CVE-2026-48775

CVE-2026-48775 · LangGraph Checkpoint: Unsafe JSON deserialization in checkpoint loading

This page contains facts from public vulnerability sources. Check the original advisory before updating.

LangGraph SQLite Checkpoint is an implementation of LangGraph CheckpointSaver that uses SQLite DB (both sync and async, via aiosqlite). In versions 4.1.0 and prior, the JsonPlusSerializer can reconstruct Python objects from JSON checkpoint payloads. Under conditions where someone could modify checkpoint bytes at rest in the backing store, the deserialization path could reconstruct objects beyond what the application expects, which could in turn result in code execution at checkpoint load time. This is a defense-in-depth issue. The affected behavior is reachable only when checkpoint bytes at rest in the backing store can be modified by an unauthorized party. In most deployments that prerequisite already implies a serious incident; the additional concern is turning "checkpoint-store write access" into code execution in the application runtime. This issue has been fixed in version 4.1.1.

CVSS 6.8 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • langgraph

    Versions
    • < 1.2.2: Affected

    No fix published

  • langraph-checkpoint

    Versions
    • < 4.1.1: Affected

    No fix published

  • langgraph-checkpoint PyPI

    Versions
    • 1.0.0
    • 1.0.1
    • 1.0.10
    • 1.0.11
    • 1.0.12
    • 1.0.13
    • 1.0.14
    • 1.0.2
    • 1.0.3
    • 1.0.4
    • 1.0.5
    • 1.0.6
    • 1.0.7
    • 1.0.8
    • 1.0.9
    • 2.0.0
    • 2.0.1
    • 2.0.10
    • 2.0.12
    • 2.0.13
    • 2.0.14
    • 2.0.15
    • 2.0.16
    • 2.0.17
    • 2.0.18
    • 2.0.19
    • 2.0.2
    • 2.0.20
    • 2.0.21
    • 2.0.22
    • 2.0.23
    • 2.0.24
    • 2.0.25
    • 2.0.26
    • 2.0.3
    • 2.0.4
    • 2.0.5
    • 2.0.6
    • 2.0.7
    • 2.0.8
    • 2.0.9
    • 2.1.0
    • 2.1.1
    • 2.1.2
    • 3.0.0
    • 3.0.1
    • 4.0.0
    • 4.0.1
    • 4.0.1rc1
    • 4.0.1rc2
    • 4.0.1rc3
    • 4.0.2
    • 4.0.3
    • 4.1.0
    • 4.1.0a1
    • 4.1.0a2
    • 4.1.0a3
    • 4.1.0a4
    Affected ranges
    • ECOSYSTEM: < 4.1.1

    Update to 4.1.1

Original sources

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