jhaals yopass up to 14.6.x Prometheus metrics middleware pkg/server/server.go Method resource consumption

Summaryinfo

A vulnerability labeled as problematic has been found in jhaals yopass up to 14.6.x. Impacted is an unknown function of the file pkg/server/server.go of the component Prometheus metrics middleware. The manipulation of the argument Method results in resource consumption. This vulnerability is reported as CVE-2026-107840. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in jhaals yopass up to 14.6.x. Affected is an unknown part of the file pkg/server/server.go of the component Prometheus metrics middleware. The manipulation of the argument Method with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

yopass is a service for securely sharing secrets, passwords, and files. Prior to version 14.7.0, the Prometheus metrics middleware in pkg/server/server.go uses the attacker-controlled r.Method value directly as the method label for yopass_http_requests_total and yopass_http_request_duration_seconds. Because the catch-all route accepts arbitrary HTTP method tokens, an unauthenticated remote attacker can submit many unique methods and create metric series that the Prometheus registry never evicts. The resulting monotonic memory growth can OOM-kill the process, while the expanding registry also degrades /metrics scrape latency and can blind monitoring. This issue is fixed in version 14.7.0.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-107840 since 10/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 14.7.0 eliminates this vulnerability.

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Productinfo

Vendor

• jhaals

Name

• yopass

Version

• 14.0
• 14.1
• 14.2
• 14.3
• 14.4
• 14.5
• 14.6

Website

• Product: https://github.com/jhaals/yopass/

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