CVE-2026-28277: LangGraph Unsafe Msgpack Checkpoint Deserialization
LangGraph
LangGraph checkpointers use msgpack in a way that allows arbitrary Python object reconstruction during deserialization. Exploitation requires prior persistence layer compromise to inject crafted checkpoint data.
disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why
- CVSS
- 6.8
- EPSS
- 0.05 · top 8% · 2026-11-13
- fix status
- Fix status unknown
- first report
- 5 Mar 2026
- last update
- 5 Mar 2026
- CVE ids
Timeline · 1
Sources · 1
Advisories and databases
- 2026-03-05CVE-2026-28277: LangGraph checkpoint loading has unsafe msgpack deserializationGitHub Advisory Database · github.com/advisories/GHSA-g48c-2wqr-h844
Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.
Classification
- lane
- Patch now
- AI role
- Attack on AI
- categories
- Infrastructure vulnerability
- severity
- 2 · Disclosed vulnerability
- fix status
- Fix status unknown
- targets
- Framework / tooling
- owasp llm top 10
- LLM03:2025 Supply Chain
- mitre atlas
- no technique for these categories
- dates
- happened 5 Mar 2026 · first reported 5 Mar 2026
- origin
- GitHub Advisory DatabaseVulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
- record
- confidence 0.95 · created 2026-10-18 07:00Z · updated 2026-10-18 07:00Z
Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned
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the brief as text
# CVE-2026-28277: LangGraph Unsafe Msgpack Checkpoint Deserialization https://gcdradar.vercel.app/incidents/cve-2026-28277-langgraph-unsafe-msgpack-checkpoint-deseriali · AIR-2026-0489 · closed 2026-03-05 - Lane: Patch now - Severity: 2 (Disclosed vulnerability) - Fix status: Fix status unknown - First reported: 2026-03-05 - AI role: Attack on AI - Products: LangGraph - CVE ids: CVE-2026-28277 - CVSS: 6.8 ## Summary LangGraph checkpointers use msgpack in a way that allows arbitrary Python object reconstruction during deserialization. Exploitation requires prior persistence layer compromise to inject crafted checkpoint data. ## What to do No action recorded; read the sources below and the vendor's advisory. ## Latest updates - 2026-03-05: CVE-2026-28277: LangGraph checkpoint loading has unsafe msgpack deserialization (https://github.com/advisories/GHSA-g48c-2wqr-h844) ## Sources - 2026-03-05 GitHub Advisory Database: CVE-2026-28277: LangGraph checkpoint loading has unsafe msgpack deserialization https://github.com/advisories/GHSA-g48c-2wqr-h844 Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.
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