CVE-2025-14987
CVE-2025-14987 is a CWE-863 vulnerability in go.temporal.io/server. O3 Security confirms whether CVE-2025-14987 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Cross Namespace Commands Authorization Bypass
Real-World Exposure
go.temporal.io/server🐹go.temporal.io/server🐹go.temporal.io/server🐹go.temporal.io/serverReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
When system.enableCrossNamespaceCommands is enabled (on by default), the Temporal server permits certain workflow task commands (e.g. StartChildWorkflowExecution, SignalExternalWorkflowExecution, RequestCancelExternalWorkflowExecution) to target a different namespace than the namespace authorized at the gRPC boundary. The frontend authorizes RespondWorkflowTaskCompleted based on the outer request namespace, but the history service later resolves and executes the command using the namespace embedded in command attributes without authorizing the caller for that target namespace. This can allow a worker authorized for one namespace to create, signal, or cancel workflows in another namespace. This issue affects Temporal: through 1.29.1. Fixed in 1.27.4, 1.28.2, 1.29.2.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | go.temporal.io/server | all versions | 1.27.4 |
| 🐹Go | go.temporal.io/server | ≥ 1.28.0&&< 1.28.2 | 1.28.2 |
| 🐹Go | go.temporal.io/server | ≥ 1.29.0&&< 1.29.2 | 1.29.2 |
| 🐹Go | go.temporal.io/server | ≥ 1.29.0-0&&< 1.29.0-135.0.0.20251218190115-b292a32bacdf | 1.29.0-135.0.0.20251218190115-b292a32bacdf |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for go.temporal.io/server. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update go.temporal.io/server to 1.27.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-14987 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2025-14987 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2025-14987. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2025-14987 in your dependencies?
O3 detects CVE-2025-14987 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.