What’s Vulnerable › Vulnerabilities

CVE-2026-100675: stoatchat before 0.15.5 Denial of Service via mass mentions

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-26 · updated 2026-09-28
• Weakness: CWE-248

Description

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.

Affected products

• stoatchat: before 0.15.5 — fixed in 0.15.5

How to fix

Upgrade to a fixed version: stoatchat 0.15.5. Check the vendor advisory for mitigations.

References

• https://github.com/stoatchat/stoatchat/security/advisories/GHSA-5gq6-v4cf-3qq8
• https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-denial-of-service-via-mass-mentions
• https://github.com/stoatchat/stoatchat/security/advisories/GHSA-5gq6-v4cf-3qq8

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