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CVE-2026-93849medium6.5

Mattermost allows authenticated users to trigger excessive memory allocation via crafted msgpack binary WebSocket frames

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 Mattermost fail to apply allocation limits to the byte-string decode paths in its WebSocket msgpack decoder, which allows an authenticated remote attacker to cause excessive server memory allocation via a crafted binary WebSocket frame declaring a Bin32 payload length of up to 4,294,967,295 bytes.. Mattermost Advisory ID: MMSA-2026-00768

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 Mattermost fail to apply allocation limits to the byte-string decode paths in its WebSocket msgpack decoder, which allows an authenticated remote attacker to cause excessive server memory allocation via a crafted binary WebSocket frame declaring a Bin32 payload length of up to 4,294,967,295 bytes.. Mattermost Advisory ID: MMSA-2026-00768

References