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CVE-2026-10819

MEDIUM
6.5
CVSS 3.1
Description
Mattermost versions 11.6.x <= 11.6.5, 10.11.x <= 10.11.20, 11.8.x <= 11.8.1, 11.7.x <= 11.7.4 fail to limit the number of frames and enforce the file size cap on animated GIF uploads, which allows an authenticated attacker to cause a denial of service via a crafted animated GIF uploaded as a custom emoji.. Mattermost Advisory ID: MMSA-2026-00695

Metadata

CVE ID
CVE-2026-10819
State
PUBLISHED
Assigner
Mattermost
Reserved
2026-06-04 07:34 UTC
Published
2026-07-27 14:15 UTC
Last updated
2026-07-27 15:05 UTC
Primary CWE
CWE-409
CWE-409: Improper Handling of Highly Compressed Data (Data A…
Vendor / Product
Mattermost / Mattermost
Sources
cve.org  ·  NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
Mattermost Mattermost — 11.6.0 ≤ 11.6.5, 10.11.0 ≤ 10.11.20, 11.8.0 ≤ 11.8.1, 11.7.0 ≤ 11.7.4 …
Weakness (CWE)
CWESourceDescription
CWE-409 cna CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.5 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References (1)
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