CVE-2026-3114Disclosure(mattermost / mattermost_server)

LOWCVSS 6.5 · MEDIUM

Signal is active with 2 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate decompressed archive entry sizes during file extraction which allows authenticated users with file upload permissions to cause a denial of service via crafted zip archives containing highly compressed entries (zip bombs) that exhaust server memory.. Mattermost Advisory ID: MMSA-2026-00598

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0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories

https://mattermost.com/security-updates

Weakness type (CWE)

CWE-409

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

mattermost_server

Threat summary

2 mentions across 1 observed day

What's happening

Technical details provided in 2 signals
Disclosure: 2 classified signals
2 total mentions across 1 day

Affected systems

Vendors

mattermost

Products

mattermost_server

1 version affected across 1 product

Deep dive

Activity timeline2 mentions / 1d

Signal classification1 categories

Disclosure

2100.0%

Referenced assets2 URLs

By indicator

Full discourse2 posts

Infoflowcloud@infoflowcloud194d
Disclosure
🚨*CVE* CVE-2026-3114 Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate decompressed archive entry sizes during file extraction w… https://www.cve.org/CVERecord?id=CVE-2026-3114 ----- Traducción: CVE-2026-3114 Mat… http://infoflow.cloud`
Post summary
The tweet announces CVE-2026-3114 for Mattermost, detailing a validation issue with decompressed archive entries, without providing PoC, exploit, or patch information.
0000032
65 followersView on X
CVE@CVEnew194d
Disclosure
CVE-2026-3114 Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate decompressed archive entry sizes during file extraction w… https://www.cve.org/CVERecord?id=CVE-2026-3114
Post summary
The post discloses CVE-2026-3114, identifies affected Mattermost versions, and describes a flaw in archive size validation.
00000232
56.9K followersView on X

CPE platform detail2 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

2 of 2 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	mattermost	mattermost_server	-	-	-
App	mattermost	mattermost_server	11.4.0	-	-

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