Zipbomb DoS via Missing Slack Import Validation

published 2024-12-16 22 mo ago modified 2026-06-17 4 mo ago also GHSA-v647-h8jj-fw5r , GO-2024-3340 , EUVD-2024-3533

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits: 0; none known

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.

Patch / fix

fixed in 3 distros 1

go github.com/mattermost/mattermost/server/v8 9.5.13, 9.11.5, 10.0.3, 10.1.3
go github.com/mattermost/mattermost-server 9.5.13+incompatible, 9.11.5+incompatible, 10.0.3+incompatible, 10.1.3+incompatible
Mattermost Mattermost 9.5.13, 9.11.5, 10.0.3, 10.1.3, 10.2.0

govulncheck-vulndb openSUSE Tumbleweed 0.0.20241218T202206-1.1

opensuse advisories openSUSE-SU-2024:14603-1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 22 mo ago (2024-12-16)

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	4.9	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
GitHub	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
go	github.com/mattermost/mattermost/server/v8	>=10.1.0, <10.1.3 >=10.0.0, <10.0.3 >=9.11.0, <9.11.5 >=9.5.0, <9.5.13 all versions	10.1.3 10.0.3 9.11.5 9.5.13
go	github.com/mattermost/mattermost-server	>=9.5.0+incompatible, <9.5.13+incompatible >=9.11.0+incompatible, <9.11.5+incompatible >=10.0.0+incompatible, <10.0.3+incompatible >=10.1.0+incompatible, <10.1.3+incompatible	9.5.13+incompatible 9.11.5+incompatible 10.0.3+incompatible 10.1.3+incompatible
go	github.com/mattermost/mattermost-server/v5	all versions	no fix listed
go	github.com/mattermost/mattermost-server/v6	all versions	no fix listed

Affected products

Mattermost Mattermost

Classification

Weakness

CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)

References

mattermost.com /security-updates
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2024-54682
advisory
github.com /mattermost/mattermost
package
github.com /advisories/GHSA-v647-h8jj-fw5r
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary