CVE-2026-107840: Github.com/jhaals/yopass Yopass Prometheus Metrics Middleware Allows Vulnerability

HIGH
Advisory Identifier: GHSA-6r69-c6wg-7g8m
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CVSS 7.5
CWE-400
Published
Advisory Summary

CVE-2026-107840 is a HIGH (CVSS 7.5) yopass prometheus metrics middleware allows vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Github.com/jhaals/yopass libraries in the Go ecosystem. The issue involves yopass prometheus metrics middleware allows remote memory exhaustion through unbounded method labels. Remediation is available by upgrading affected packages to version 0.0.0-20260727191436-61e31ead04a4.

CVE-2026-107840 at a Glance

CVE Identifier CVE-2026-107840
GHSA Identifier GHSA-6r69-c6wg-7g8m
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Github.com/jhaals/yopass
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-107840

To remediate this vulnerability, upgrade all affected Github.com/jhaals/yopass dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/jhaals/yopass fixed: 0.0.0-20260727191436-61e31ead04a4 
Upgrade github.com/jhaals/yopass to 0.0.0-20260727191436-61e31ead04a4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/jhaals/yopass

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-107840, inspect your project dependencies for Github.com/jhaals/yopass:

inspect dependencies for github.com/jhaals/yopass

Analyze the terminal output to locate any version of Github.com/jhaals/yopass in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.0.0-20260727191436-61e31ead04a4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Github.com/jhaals/yopass, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

The Prometheus metrics middleware in pkg/server/server.go used r.Method directly as a label value on request counter and duration histogram metrics. Since the mux catch-all route matches any HTTP method, an unauthenticated attacker can send requests with arbitrary method strings (e.g. curl -X "M1" http://host/), each creating new counter and histogram time series in the Prometheus registry. The registry's internal maps never evict entries. An attacker issuing requests with unique method values causes monotonic memory growth until the process is OOM-killed. Additionally, /metrics scrape latency degrades proportionally, eventually timing out and blinding monitoring. Remediation: Upgrade to 14.7.0 or later, which clamps the method label to a fixed allowlist (GET, POST, PUT, DELETE, OPTIONS, HEAD, CONNECT, TRACE) and maps everything else to other.

CVE-2026-107840 Affected Github.com/jhaals/yopass Versions

1 component(s)
Fixed Versions:
0.0.0-20260727191436-61e31ead04a4
Product / Package Ecosystem Affected Versions Fixed Version
github.com/jhaals/yopass
golang/github.com/jhaals/yopass
Go
< 0.0.0-20260727191436-61e31ead04a4
0.0.0-20260727191436-61e31ead04a4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/jhaals/yopass/security/advisories/GHSA-6r69-c6wg-7g8m
NVD — CVE-2026-107840 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107840
Github.com/jhaals/yopass Source Repository REPOSITORY
https://github.com/jhaals/yopass/pull/3773
Security Fix Commit FIX COMMIT
https://github.com/jhaals/yopass/commit/61e31ead04a4fc27ce80bed226af41c7c0426ccf
Security Fix Commit FIX COMMIT
https://github.com/jhaals/yopass/commit/78d0c14f7085048130199662a2ec8a18ec8d6ebb
Github.com/jhaals/yopass Source Repository REPOSITORY
https://github.com/jhaals/yopass
Github.com/jhaals/yopass Release RELEASE
https://github.com/jhaals/yopass/releases/tag/14.7.0

Frequently Asked Questions

What is CVE-2026-107840?
CVE-2026-107840 is a security vulnerability in Github.com/jhaals/yopass involving yopass Prometheus metrics middleware allows remote memory exhaustion through unbounded method labels under CWE-400: Uncontrolled Resource Consumption.
Which Github.com/jhaals/yopass versions are affected?
Affected versions include releases prior to 0.0.0-20260727191436-61e31ead04a4 across affected packages: github.com/jhaals/yopass.
What version fixes CVE-2026-107840?
Upgrading to 0.0.0-20260727191436-61e31ead04a4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/jhaals/yopass affected?
Yes, github.com/jhaals/yopass is affected in releases prior to 0.0.0-20260727191436-61e31ead04a4. Upgrade your dependency to 0.0.0-20260727191436-61e31ead04a4 or later.
What is the CVSS score of CVE-2026-107840?
CVE-2026-107840 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-107840?
CVE-2026-107840 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check Go dependencies for CVE-2026-107840?
Run the dependency tree command: 'inspect dependencies for github.com/jhaals/yopass'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6r69-c6wg-7g8m",
  "modified" : "2026-10-09T20:42:58Z",
  "published" : "2026-10-09T20:42:58Z",
  "aliases" : [ "CVE-2026-107840" ],
  "summary" : "yopass Prometheus metrics middleware allows remote memory exhaustion through unbounded method labels",
  "details" : "The Prometheus metrics middleware in pkg/server/server.go used r.Method directly as a label value on request counter and duration histogram metrics. Since the mux catch-all route matches any HTTP method, an unauthenticated attacker can send requests with arbitrary method strings (e.g. curl -X \"M1\" http://host/), each creating new counter and histogram time series in the Prometheus registry. The registry's internal maps never evict entries.\n\nAn attacker issuing requests with unique method values causes monotonic memory growth until the process is OOM-killed. Additionally, /metrics scrape latency degrades proportionally, eventually timing out and blinding monitoring.\n\nRemediation: Upgrade to 14.7.0 or later, which clamps the method label to a fixed allowlist (GET, POST, PUT, DELETE, OPTIONS, HEAD, CONNECT, TRACE) and maps everything else to other.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/jhaals/yopass"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.0.0-20260727191436-61e31ead04a4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/jhaals/yopass/security/advisories/GHSA-6r69-c6wg-7g8m"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-107840"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jhaals/yopass/pull/3773"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jhaals/yopass/commit/61e31ead04a4fc27ce80bed226af41c7c0426ccf"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jhaals/yopass/commit/78d0c14f7085048130199662a2ec8a18ec8d6ebb"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jhaals/yopass"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jhaals/yopass/releases/tag/14.7.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-09T20:42:58Z",
    "nvd_published_at" : "2026-10-09T18:17:05Z"
  }
}