CVE-2026-89140: Temporal Technologies, Inc. Temporal Server

Temporal Server internal completion callbacks are not bound to their namespace, allowing cross-namespace changes to Scheduler V2 schedule state

CVSS 6.0 MediumEPSS 0.0033 · 26th percentile

Published by the CVE Program (CNA: Temporal) at 12 Oct 2026, 18:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Temporal Technologies, Inc.	Temporal Server Package name: go.temporal.io/server https://pkg.go.dev	affected 1.30.0 to before 1.30.8 semver Other versions: unaffected
Temporal Technologies, Inc.	Temporal Server Package name: go.temporal.io/server https://pkg.go.dev	affected 1.31.0 to before 1.31.4 semver Other versions: unaffected
Temporal Technologies, Inc.	Temporal Server Package name: go.temporal.io/server https://pkg.go.dev	affected 1.32.0 to before 1.32.1 semver Other versions: unaffected

Identifiers

CVE-2026-89140

CNA

Temporal

Weakness (CWE)

CWE-639

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

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:N/VI:H/VA:N/SC:N/SI:N/SA:N	CNA (Temporal)

CISA KEV Not listed.
EPSS 0.0033, the 26th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 12 Oct 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/temporalio/temporal/pull/11876 patch
github.com/temporalio/temporal/commit/a210eeb8c2cc7e22338bb4f552ff1171d8f35969 patch
github.com/temporalio/temporal/pull/12318 patch
github.com/temporalio/temporal/pull/12319 patch
github.com/temporalio/temporal/pull/12382 patch
github.com/temporalio/temporal/pull/12320 patch
github.com/temporalio/temporal/commit/d0bd72e85014f31ecfbada1b436b08806496dbef patch
github.com/temporalio/temporal/releases/tag/v1.30.8 release-notes
github.com/temporalio/temporal/releases/tag/v1.31.4 release-notes
github.com/temporalio/temporal/releases/tag/v1.32.1 release-notes

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.