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stoatchat before 0.15.5 Denial of Service via mass mentions

Type: advisorySources: OSV

stoatchat versions before 0.15.5 contain a denial of service vulnerability in the acknowledgement worker that processes mass mention messages. Authenticated users can send five crafted role-mention messages to terminate all acknowledgement workers, disabling push notifications and mention badges deployment-wide until the API process restarts.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-100675
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 05:07 UTC · Revision 1

Source evidence

stoatchat before 0.15.5 Denial of Service via mass mentions

core-osv · Original source

Published 26 Sept 2026, 13:23 UTC

stoatchat versions before 0.15.5 contain a denial of service vulnerability in the acknowledgement worker that processes mass mention messages. Authenticated users can send five crafted role-mention messages to terminate all acknowledgement workers, disabling push notifications and mention badges deployment-wide until the API process restarts.

osv:CVE-2026-100675
Complete source record
{
  "id": "bffb70a7e19806992ea6ace8db57bad3522c33605d1418681c7b2745f6b6d863",
  "url": "https://osv.dev/vulnerability/CVE-2026-100675",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "stoatchat before 0.15.5 Denial of Service via mass mentions",
    "summary": "stoatchat versions before 0.15.5 contain a denial of service vulnerability in the acknowledgement worker that processes mass mention messages. Authenticated users can send five crafted role-mention messages to terminate all acknowledgement workers, disabling push notifications and mention badges deployment-wide until the API process restarts.",
    "evidence": "osv:CVE-2026-100675",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-100675",
      "aliases": [
        "CVE-2026-100675",
        "GHSA-5gq6-v4cf-3qq8"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/stoatchat/stoatchat",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "dc31dd7e62c1f8806b663549700a4121537b9530"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.15.5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.15.5"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100675.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.418409304Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100675.json",
        "https://github.com/stoatchat/stoatchat/security/advisories/GHSA-5gq6-v4cf-3qq8",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100675",
        "https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-denial-of-service-via-mass-mentions"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-248"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100675.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-100675",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500438,
  "published_at": "2026-09-26T13:23:38.319+00:00"
}