# CVE-2025-8396

> CVE-2025-8396. CVSS 6.9 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2025-8396
Last updated: 2026-06-17T10:06:53Z

- Published: 2025-09-15 14:13 UTC · Updated: 2026-06-17 10:06 UTC · Assigner: Temporal
- CVSS: 6.9 (CVSS 4.0) · Severity: Medium
- EPSS: 0.39%, 33th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-770

## Description

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.

## Affected vendors and products

- Temporal: OSS Server

## Tracked companies

- [Temporal Cloud](https://rewindex.com/company/temporal-cloud.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-8396)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-8396)
- [https://github.com/temporalio/temporal/releases/tag/v1.26.3](https://github.com/temporalio/temporal/releases/tag/v1.26.3)
- [https://github.com/temporalio/temporal/releases/tag/v1.27.3](https://github.com/temporalio/temporal/releases/tag/v1.27.3)
- [https://github.com/temporalio/temporal/releases/tag/v1.28.1](https://github.com/temporalio/temporal/releases/tag/v1.28.1)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-8396 · Markdown: https://rewindex.com/cve/CVE-2025-8396.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-8396 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:13:06.346Z