Memory Allocation with Excessive Size Value Affecting github.com/mattermost/mattermost/server/channels/app/platform package, versions >=10.11.0-rc1 <10.11.15-rc1>=11.4.0-rc1 <11.4.5>=11.5.0-rc1 <11.5.3>=11.6.0-rc1 <11.6.1-rc1
Threat Intelligence
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The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMMATTERMOSTMATTERMOSTSERVERCHANNELSAPPPLATFORM-16873771
- published24 May 2026
- disclosed22 May 2026
- creditZephrFish
Introduced: 22 May 2026
CVE-2026-5740 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/channels/app/platform to version 10.11.15-rc1, 11.4.5, 11.5.3, 11.6.1-rc1 or higher.
Overview
Affected versions of this package are vulnerable to Memory Allocation with Excessive Size Value in the WebSocket process. An attacker can cause the server to crash and disrupt service availability for all users by sending a specially crafted binary WebSocket message to the public endpoint.