CVE-2026-104355: Temporal Technologies, Inc. Temporal Server

Temporal Server applies inbound namespace replication from a connected peer cluster to local namespaces

CVSS 7.0 HighEPSS 0.0036 · 29th percentile

Published by the CVE Program (CNA: Temporal) at 12 Oct 2026, 18:43 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	unknown 0.0.0 to before 1.0.0 semver affected 1.0.0 to 1.29.7, inclusive semver affected 1.30.0 to before 1.30.8 semver affected 1.31.0 to before 1.31.4 semver affected 1.32.0 to before 1.32.1 semver Other versions: unaffected

Identifiers

CVE-2026-104355

CNA

Temporal

Weakness (CWE)

CWE-863

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
7.0	High	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N	CNA (Temporal)

CISA KEV Not listed.
EPSS 0.0036, the 29th 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/blob/v1.0.0/common/namespace/replicationTaskExecutor.go#L191-L260 product
github.com/temporalio/temporal/pull/12323 patch
github.com/temporalio/temporal/commit/f2b571e2eee8a9143fbc4711f3db8b5a37146b3b patch
github.com/temporalio/temporal/pull/12328 patch
github.com/temporalio/temporal/pull/12329 patch
github.com/temporalio/temporal/pull/12330 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.