CVE-2025-1243: Go.temporal.io/api Unencrypted Transmission Vulnerability

LOW
Advisory Identifier: GHSA-q9w6-cwj4-gf4p
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CWE-311
Published
Advisory Summary

CVE-2025-1243 is a LOW unencrypted transmission vulnerability (CWE-311: Missing Encryption of Sensitive Data) affecting Go.temporal.io/api libraries in the Go ecosystem. The issue involves unencrypted transmission in temporal api-go library. Remediation is available by upgrading affected packages to version 1.44.1.

CVE-2025-1243 at a Glance

CVE Identifier CVE-2025-1243
GHSA Identifier GHSA-q9w6-cwj4-gf4p
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-311: Missing Encryption of Sensitive Data
Affected Product Go.temporal.io/api
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2025-1243

To remediate this vulnerability, upgrade all affected Go.temporal.io/api dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

go.temporal.io/api fixed: 1.44.1 
Upgrade go.temporal.io/api to 1.44.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for go.temporal.io/api

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-1243, inspect your project dependencies for Go.temporal.io/api:

inspect dependencies for go.temporal.io/api

Analyze the terminal output to locate any version of Go.temporal.io/api in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.44.1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-311: Missing Encryption of Sensitive Data, where the product does not encrypt sensitive or critical information before storage or transmission. In Go.temporal.io/api, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2025-1243 Affected Go.temporal.io/api Versions

1 component(s)
Fixed Versions:
1.44.1
Product / Package Ecosystem Affected Versions Fixed Version
go.temporal.io/api
golang/go.temporal.io/api
Go
< 1.44.1
1.44.1

References

NVD — CVE-2025-1243 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-1243
Security Fix Commit FIX COMMIT
https://github.com/temporalio/api-go/commit/dad8b169ada911d3778e070484d1ae78a58bd22b
Go.temporal.io/api Source Repository REPOSITORY
https://github.com/temporalio/api-go
Go.temporal.io/api Release RELEASE
https://github.com/temporalio/api-go/releases/tag/v1.44.1
temporal.io/blog/announcing-a-n... WEB
https://temporal.io/blog/announcing-a-new-operation-workflow-update

Frequently Asked Questions

What is CVE-2025-1243?
CVE-2025-1243 is a security vulnerability in Go.temporal.io/api involving Unencrypted transmission in Temporal api-go library under CWE-311: Missing Encryption of Sensitive Data.
Which Go.temporal.io/api versions are affected?
Affected versions include releases prior to 1.44.1 across affected packages: go.temporal.io/api.
What version fixes CVE-2025-1243?
Upgrading to 1.44.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is go.temporal.io/api affected?
Yes, go.temporal.io/api is affected in releases prior to 1.44.1. Upgrade your dependency to 1.44.1 or later.
What CWE is associated with CVE-2025-1243?
CVE-2025-1243 is classified under CWE-311: Missing Encryption of Sensitive Data (The product does not encrypt sensitive or critical information before storage or transmission.).
How can I check Go dependencies for CVE-2025-1243?
Run the dependency tree command: 'inspect dependencies for go.temporal.io/api'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q9w6-cwj4-gf4p",
  "modified" : "2025-02-12T19:37:52Z",
  "published" : "2025-02-12T03:31:14Z",
  "aliases" : [ "CVE-2025-1243" ],
  "summary" : "Unencrypted transmission in Temporal api-go library",
  "details" : "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.\n\nOther 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.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "go.temporal.io/api"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.44.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-1243"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/temporalio/api-go/commit/dad8b169ada911d3778e070484d1ae78a58bd22b"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/temporalio/api-go"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/temporalio/api-go/releases/tag/v1.44.1"
  }, {
    "type" : "WEB",
    "url" : "https://temporal.io/blog/announcing-a-new-operation-workflow-update"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-311" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-02-12T19:37:52Z",
    "nvd_published_at" : "2025-02-12T01:15:09Z"
  }
}