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PatchSiren cyber security CVE debrief

CVE-2026-48775 langchain-ai CVE debrief

CVE-2026-48775 is a defense-in-depth issue in LangGraph SQLite Checkpoint's JsonPlusSerializer. 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 issue has been fixed in version 4.1.1.

Vendor
langchain-ai
Product
langgraph
CVSS
MEDIUM 6.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-16
Original CVE updated
2026-06-24
Advisory published
2026-06-16
Advisory updated
2026-06-24

Who should care

Users of LangGraph SQLite Checkpoint versions 4.1.0 and prior who store checkpoint data in a location that may be modified by unauthorized parties.

Technical summary

The JsonPlusSerializer in LangGraph SQLite Checkpoint can reconstruct Python objects from JSON checkpoint payloads. If checkpoint bytes at rest can be modified, this could lead to code execution at checkpoint load time.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update to version 4.1.1 or later
  • Ensure checkpoint data is stored securely to prevent unauthorized modifications

Evidence notes

This issue is a defense-in-depth concern. The affected behavior is reachable only when checkpoint bytes at rest in the backing store can be modified by an unauthorized party.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-48775 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-48775

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-48775 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-48775

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.