Vulnerability · Published Oct 9, 2026 · Assigned by GitHub_M
CVE-2026-107840yopass Prometheus metrics middleware allows remote memory exhaustion through unbounded method labels
High 7.5
In plain English
A high-severity uncontrolled resource consumption in yopass from jhaals. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/jhaals/yopass | 0.0.0-20260727191436-61e31ead04a4 | GHSA-6r69-c6wg-7g8m |
| Go | github.com/jhaals/yopass | 0.0.0-20260727191436-61e31ead04a4 | GO-2026-6720 |
Affected products (as reported)
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/jhaals/yopass/security/advisories/GHSA-6r69-c6wg-7g8m x_refsource_CONFIRM
- https://github.com/jhaals/yopass/pull/3773 x_refsource_MISC
- https://github.com/jhaals/yopass/commit/61e31ead04a4fc27ce80bed226af41c7c0426ccf x_refsource_MISC
- https://github.com/jhaals/yopass/commit/78d0c14f7085048130199662a2ec8a18ec8d6ebb x_refsource_MISC
- https://github.com/jhaals/yopass/releases/tag/14.7.0 x_refsource_MISC