Medium severity · published Sep 15, 2025
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…
6.9
CVSS
0.4%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OS
OSS Server · Temporal
before 1.26.3; 1.27.0 before 1.27.3; 1.28.0 before 1.28.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-8396
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-8396
github.com
https://github.com/temporalio/temporal/releases/tag/v1.26.3
github.com
https://github.com/temporalio/temporal/releases/tag/v1.27.3
github.com
https://github.com/temporalio/temporal/releases/tag/v1.28.1