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CVE-2025-8396

MEDIUM
6.9
CVSS Score
Published: September 15, 2025 at 02:13 PM UTC
Updated: June 17, 2026 at 10:06 AM UTC
1 product affected across 1 vendorTemporal

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Temporal· Temporalgo
60%
v < 1.26.31.27.0 ≤ v < 1.27.31.28.0 ≤ v < 1.28.11.27.01.28.0
Affected range stops below 1.26.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.27.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.28.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

Source: [email protected]
https://github.com/temporalio/temporal/releases/tag/v1.26.3
Source: [email protected]
https://github.com/temporalio/temporal/releases/tag/v1.27.3
Source: [email protected]
https://github.com/temporalio/temporal/releases/tag/v1.28.1

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMTemporal
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-770

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