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CVE-2026-93850medium6.5

Unbounded memory consumption during PDF text extraction

Impact

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to bind the volume of text extracted from an uploaded PDF which allows an authenticated user to exhaust server memory and cause a denial of service via a crafted PDF whose compressed content stream expands into a very large amount of text.. Mattermost Advisory ID: MMSA-2026-00769

Source excerpt · Mattermost

What to do

Update Mattermost to versions 11.11.0, 11.9.2, 11.8.6, 11.7.11, 11.10.2 or higher.

Mattermost guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Mattermost · Mattermost

Other versions: unaffected

Version / rangeSource status
11.9.0 through 11.9.1 (inclusive)affected
11.8.0 through 11.8.5 (inclusive)affected
11.7.0 through 11.7.10 (inclusive)affected
11.10.0 through 11.10.1 (inclusive)affected
11.11.0unaffected
11.9.2unaffected
11.8.6unaffected
11.7.11unaffected
11.10.2unaffected
Mattermost version evidence

Original source description

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to bind the volume of text extracted from an uploaded PDF which allows an authenticated user to exhaust server memory and cause a denial of service via a crafted PDF whose compressed content stream expands into a very large amount of text.. Mattermost Advisory ID: MMSA-2026-00769

References