Temporal OSS Server up to 1.26.2/1.27.2/1.28.0 allocation of resources

Summaryinfo

A vulnerability identified as problematic has been detected in Temporal OSS Server up to 1.26.2/1.27.2/1.28.0. This vulnerability affects unknown code. Performing a manipulation results in allocation of resources. This vulnerability is reported as CVE-2025-8396. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Temporal OSS Server up to 1.26.2/1.27.2/1.28.0. It has been classified as problematic. This affects some unknown functionality. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2025-8396 since 07/30/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 1.26.3, 1.27.3 or 1.28.1 eliminates this vulnerability.

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Productinfo

Vendor

• Temporal

Name

• OSS Server

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.26.0
• 1.26.1
• 1.26.2
• 1.27
• 1.27.0
• 1.27.1
• 1.27.2
• 1.28.0

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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CVSSv3info

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Exploitinginfo

Threat Intelligenceinfo

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Entryinfo

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