# CVE-2026-107840: yopass Prometheus metrics middleware allows remote memory exhaustion through unbounded method labels

> Unauthenticated attackers can exhaust server memory by sending requests with unique HTTP methods, causing denial of service in yopass.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Oct 2026
- **Updated:** 9 Oct 2026
- **Also known as:** GHSA-6r69-c6wg-7g8m, GO-2026-6720

## What is CVE-2026-107840?

CVE-2026-107840 is a high-severity denial of service vulnerability in jhaals yopass, published on 9 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2026-107840?

3 open source packages ship an affected version, including github.com/jhaals/yopass.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/jhaals/yopass` | Go | All versions | 0.0.0-20260727191436-61e31ead04a4 |
| `github.com/jhaals/yopass` | Go | All versions | 0.0.0-20260727191436-61e31ead04a4 |
| `github.com/jhaals/yopass` | Go | All versions | 0.0.0-20260727191436-61e31ead04a4 |

## How do I fix CVE-2026-107840?

Upgrade github.com/jhaals/yopass to 0.0.0-20260727191436-61e31ead04a4 or later.

## Is CVE-2026-107840 being exploited?

There is no known exploitation of CVE-2026-107840 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-107840 and fix it if it is affected.

What it is: CVE-2026-107840 is a high-severity denial of service vulnerability in jhaals yopass, published on 9 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-107840 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/jhaals/yopass (Go): affected all versions; fixed in 0.0.0-20260727191436-61e31ead04a4
- github.com/jhaals/yopass (Go): affected all versions; fixed in 0.0.0-20260727191436-61e31ead04a4
- github.com/jhaals/yopass (Go): affected all versions; fixed in 0.0.0-20260727191436-61e31ead04a4

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-107840/ (Markdown: https://insights.sbomify.com/CVE-2026-107840/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-107840
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-107840
- OSV: https://osv.dev/vulnerability/CVE-2026-107840

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-107840/
Summaries are generated and may contain mistakes; the official description above is the record.