CVE-2026-5199
Temporal Server: attacker-controlled namespace could signal, delete, and reset workflows or activities in a victim namespace on the same cluster in go.temporal.io/server
EPSS 0.25%
Description
Temporal Server: attacker-controlled namespace could signal, delete, and reset workflows or activities in a victim namespace on the same cluster in go.temporal.io/server
How to fix CVE-2026-5199
To remediate CVE-2026-5199, upgrade the affected package to a fixed version below.
- Go/go.temporal.io/server—upgrade to 1.30.3 or later
- Go/go.temporal.io/server—upgrade to 1.29.5 or later
Is CVE-2026-5199 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 1.30.0-143.0, < 1.30.3
- from 0, < 1.29.5, >= 1.30.0-143.0, < 1.30.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L |