CVE-2026-28277
CVE-2026-28277 is a medium-severity vulnerability in Langchain Langgraph with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.
Key facts
- Severity: Medium (CVSS 3.x base score 6.8)
- EPSS exploit prediction: 5% (92nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-9860
- Weakness: CWE-502
- Affected product: Langchain Langgraph
- Published:
- Last modified:
Description
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.
Frequently asked questions
- 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.
- How severe is CVE-2026-28277?
- CVE-2026-28277 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-28277 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-28277?
- CVE-2026-28277 affects Langchain Langgraph. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-28277?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-28277 have an EU (EUVD) identifier?
- Yes. CVE-2026-28277 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9860.
- When was CVE-2026-28277 published?
- CVE-2026-28277 was published on 2026-03-05 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:langchain:langgraph:*:*:*:*:*:*:*:*
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