What is CVE-2025-8396?

CVE-2025-8396 is a vulnerability in Temporal Oss Server, classified under Allocation of Resources Without Limits or Throttling. Published 2025-09-15.

Is CVE-2025-8396 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Resource exhaustion in Temporal Oss Server

CVE-2025-8396

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.

EPSS: 0.004 (28.8th percentile) — read the EPSS interpretation.

Affected products

Temporal Oss Server — versions 0, 1.27.0, 1.28.0

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

Frequently asked questions

What is CVE-2025-8396?: CVE-2025-8396 is a vulnerability in Temporal Oss Server, classified under Allocation of Resources Without Limits or Throttling. Published 2025-09-15.
Is CVE-2025-8396 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.