CVE-2024-54682: Zipbomb DoS via Missing Slack Import Validation

Severity: medium (CVSS 4.9 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: 2024-12-16 · updated 2026-06-17
Weakness: CWE-409

Description

Mattermost versions 10.1.x <= 10.1.2, 10.0.x <= 10.0.2, 9.11.x <= 9.11.4, 9.5.x <= 9.5.12 fail to limit the file size for slack import file uploads which allows a user to cause a DoS via zip bomb by importing data in a team they are a team admin.

Affected products

Mattermost: from 9.5.0 before 9.5.13; from 9.11.0 before 9.11.5; from 10.0.0 before 10.0.3; from 10.1.0 before 10.1.3 — fixed in 10.0.3, 10.1.3, 9.11.5, 9.5.13

How to fix

Upgrade to a fixed version: Mattermost 10.0.3, 10.1.3, 9.11.5, 9.5.13. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

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