CVE-2026-93850: Unbounded memory consumption during PDF text extraction

Published Oct 26, 2026
·
Updated

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

Affected Software

1 affected component
Mattermost Mattermost<=11.9.1, <=11.8.5, <=11.7.10, <=11.10.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade Mattermost to a version that resolves this vulnerability.

    Fixed in 11.11.0
  2. Upgrade

    Upgrade Mattermost to a version that resolves this vulnerability.

    Fixed in 11.9.2
  3. Upgrade

    Upgrade Mattermost to a version that resolves this vulnerability.

    Fixed in 11.8.6
  4. Upgrade

    Upgrade Mattermost to a version that resolves this vulnerability.

    Fixed in 11.7.11
  5. Upgrade

    Upgrade Mattermost to a version that resolves this vulnerability.

    Fixed in 11.10.2

Event History

Oct 26, 2026
CVE Published
via MITRE·02:26 PM
Data Sourced
via MITRE·02:26 PM
RemedyDescriptionSeverityWeakness

Company

Resources

Contact

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