GHSA-6hmw-9432-67qq: langgraph-checkpoint-postgres (CVE-2026-115883)

Package	Ecosystem	Affected	Fixed in
langgraph-checkpoint-postgres	PyPI	<3.1.3	3.1.3
langgraph-checkpoint-sqlite	PyPI	<3.1.2	3.1.2

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Namespace labels containing "." in langgraph-checkpoint-postgres before 3.1.3 and langgraph-checkpoint-sqlite before 3.1.2 can reach other namespaces, because both stores join labels with "." when storing them. An attacker who can pass a crafted label to get, search, list_namespaces, delete or batch calls could read, overwrite or delete items belonging to another namespace, such as another tenant's data. Upgrade langgraph-checkpoint-postgres to 3.1.3 or langgraph-checkpoint-sqlite to 3.1.2, which also require langgraph-checkpoint 4.3.0.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.0	Medium	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0030, the 22nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:07 UTC First seen by agentprime
31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.