CVE-2025-8396: Temporal OSS Server Vulnerable to Allocation of Resources Without Limits or Throttling

September 15, 2025

Insufficiently specific bounds checking on authorization header could lead to denial of service in the Temporal server on all platforms due to excessive memory allocation. This issue affects all platforms and versions of OSS Server prior to 1.26.3, 1.27.3, and 1.28.1 (i.e., fixed in 1.26.3, 1.27.3, and 1.28.1 and later). Temporal Cloud services are not impacted.

References

github.com/advisories/GHSA-p768-c3pr-6459
github.com/temporalio/temporal
github.com/temporalio/temporal/releases/tag/v1.26.3
github.com/temporalio/temporal/releases/tag/v1.27.3
github.com/temporalio/temporal/releases/tag/v1.28.1
nvd.nist.gov/vuln/detail/CVE-2025-8396

Code Behaviors & Features

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