CVE-2025-1243 Field in api-go proxy not transformed before version 1.44.1
Attackers can read unencrypted update response data in gRPC proxies using the Temporal api-go library, bypassing Data Converter encryption.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-1243?
CVE-2025-1243 is a low-severity vulnerability in Temporal Technologies, Inc. api-go library, published on 12 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The Temporal api-go library prior to version 1.44.1 did not send `update response` information to Data Converter when the proxy package within the api-go module was used in a gRPC proxy prior to transmission. This resulted in information contained within the `update response` field not having Data Converter transformations (e.g. encryption) applied. This is an issue only when using the UpdateWorkflowExecution APIs (released on 13th January 2025) with a proxy leveraging the api-go library before version 1.44.1.
Other data fields were correctly sent to Data Converter. This issue does not impact the Data Converter server. Data was encrypted in transit. Temporal Cloud services are not impacted.
Weakness: CWE-311
Which versions are affected by CVE-2025-1243?
3 open source packages ship an affected version, including go.temporal.io/api.
| Package | Affected | Fixed in |
|---|---|---|
go.temporal.io/api Go | All versions | 1.44.1 |
go.temporal.io/api Go | All versions | 1.44.1 |
go.temporal.io/api Go | All versions | 1.44.1 |
How do I fix CVE-2025-1243?
Upgrade go.temporal.io/api to 1.44.1 or later.
Is CVE-2025-1243 being exploited?
There is no known exploitation of CVE-2025-1243 in the wild and no public exploit code.
Sources
Also known as GHSA-q9w6-cwj4-gf4p, GO-2025-3462.