What is 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 reconstruct Python objects during deserialization. If an attacker can modify checkpoint data in the backing store (for example, after a database compromise or other privileged write access to the persistence layer), they can potentially supply a crafted payload that triggers unsafe object reconstruction when the checkpoint is loaded. No known patch is public.
The record classifies CVE-2026-28277 under weakness class CWE-502. Its CVSS v3 base vector states that the flaw is reachable from an adjacent network, needs high-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 236 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 6.8 — MEDIUM
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 0.6% probability of exploitation in the next 30 days, higher than 51.7% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 5.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-03-05, last modified 2026-03-06
Is CVE-2026-28277 being exploited?
It currently carries a trending score of 18 in the Threadlinqs vulnerability feed.
Affected products and versions
- langchain-ai: langgraph
How to fix CVE-2026-28277
Vendor advisory: https://github.com/langchain-ai/langgraph/security/advisories/GHSA-g48c-2wqr-h844. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-28277
1 tracked threat in the Threadlinqs corpus references CVE-2026-28277, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.