CVE-2025-14822 LOW

CVE-2025-14822: DoS from quadratic complexity in model.ParseHashtags

Vendor Mattermost

Product Mattermost

Weakness CWE-407

Published January 16, 2026

Last update January 16, 2026

View on NVD All CVEs

CVSS base score

3.1/10

Attack vector Network

Attack complexity High

Privileges required Low

User interaction None

Confidentiality None

Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

What the vulnerability does

01Description

Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to exhaust CPU resources via a single HTTP request containing a post with thousands space-separated tokens

Key dates

02Disclosure timeline

January 16, 2026 CVE published

January 16, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2025-14822 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/407.html

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04Related CVE

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